release/doc/en_US.ISO8859-1/relnotes/article.xml

   1 <?xml version="1.0" encoding="iso-8859-1"?>
   2 <!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook XML V5.0-Based Extension//EN"
   3         "../../../share/xml/freebsd50.dtd" [
   4 <!ENTITY % release PUBLIC "-//FreeBSD//ENTITIES Release Specification//EN" "release.ent">
   5  %release;
   6 <!ENTITY % sponsor PUBLIC "-//FreeBSD//ENTITIES Sponsor Specification//EN" "sponsor.ent">
   7  %sponsor;
   8 <!ENTITY % vendor PUBLIC "-//FreeBSD//ENTITIES Vendor Specification//EN" "vendor.ent">
   9  %vendor;
  10 <!ENTITY security SYSTEM "../../share/xml/security.xml">
  11 <!ENTITY errata SYSTEM "../../share/xml/errata.xml">
  12 ]>
  13 <article xmlns="http://docbook.org/ns/docbook"
  14   xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
  15
  16   <info>
  17     <title>&os; &release.current; Release Notes</title>
  18
  19     <author>
  20       <orgname>The &os; Project</orgname>
  21     </author>
  22
  23     <pubdate>$FreeBSD$</pubdate>
  24
  25     <!-- Last rev: 282482 -->
  26
  27     <copyright>
  28       <year>2015</year>
  29       <holder role="mailto:doc@FreeBSD.org">The &os; Documentation
  30         Project</holder>
  31     </copyright>
  32
  33     <legalnotice xml:id="trademarks" role="trademarks">
  34       &tm-attrib.freebsd;
  35       &tm-attrib.ibm;
  36       &tm-attrib.ieee;
  37       &tm-attrib.intel;
  38       &tm-attrib.sparc;
  39       &tm-attrib.general;
  40     </legalnotice>
  41
  42     <abstract>
  43       <para>The release notes for &os; &release.current; contain
  44         a summary of the changes made to the &os; base system on the
  45         &release.branch; development line.  This document lists
  46         applicable security advisories that were issued since the last
  47         release, as well as significant changes to the &os; kernel and
  48         userland.  Some brief remarks on upgrading are also
  49         presented.</para>
  50     </abstract>
  51   </info>
  52
  53   <sect1 xml:id="intro">
  54     <title>Introduction</title>
  55
  56     <para>This document contains the release notes for &os;
  57       &release.current;.  It describes recently added, changed, or
  58       deleted features of &os;.  It also provides some notes on
  59       upgrading from previous versions of &os;.</para>
  60
  61     <para releasetype="current">The &release.type; distribution to
  62       which these release notes apply represents the latest point
  63       along the &release.branch; development branch since
  64       &release.branch; was created.  Information regarding pre-built,
  65       binary &release.type; distributions along this branch can be
  66       found at <uri
  67         xlink:href="&release.url;">&release.url;</uri>.</para>
  68
  69     <para releasetype="snapshot">The &release.type; distribution to
  70       which these release notes apply represents a point along the
  71       &release.branch; development branch between &release.prev; and
  72       the future &release.next;.  Information regarding pre-built,
  73       binary &release.type; distributions along this branch can be
  74       found at <uri
  75         xlink:href="&release.url;">&release.url;</uri>.</para>
  76
  77     <para releasetype="release">This distribution of &os;
  78       &release.current; is a &release.type; distribution.  It can be
  79       found at <uri xlink:href="&release.url;">&release.url;</uri> or
  80       any of its mirrors.  More information on obtaining this (or
  81       other) &release.type; distributions of &os; can be found in the
  82       <link
  83         xlink:href="&url.books.handbook;/mirrors.html"><quote>Obtaining
  84           &os;</quote> appendix</link> to the <link
  85         xlink:href="&url.books.handbook;/">&os;
  86         Handbook</link>.</para>
  87
  88     <para>All users are encouraged to consult the release errata
  89       before installing &os;.  The errata document is updated with
  90       <quote>late-breaking</quote> information discovered late in the
  91       release cycle or after the release.  Typically, it contains
  92       information on known bugs, security advisories, and corrections
  93       to documentation.  An up-to-date copy of the errata for &os;
  94       &release.current; can be found on the &os; Web site.</para>
  95
  96     <para>This document describes the most user-visible new or changed
  97       features in &os; since &release.prev;.  In general, changes
  98       described here are unique to the &release.branch; branch unless
  99       specifically marked as &merged; features.</para>
 100
 101     <para>Typical release note items document recent security
 102       advisories issued after &release.prev;, new drivers or hardware
 103       support, new commands or options, major bug fixes, or
 104       contributed software upgrades.  They may also list changes to
 105       major ports/packages or release engineering practices.  Clearly
 106       the release notes cannot list every single change made to &os;
 107       between releases; this document focuses primarily on security
 108       advisories, user-visible changes, and major architectural
 109       improvements.</para>
 110   </sect1>
 111
 112   <sect1 xml:id="upgrade">
 113     <title>Upgrading from Previous Releases of &os;</title>
 114
 115     <para arch="amd64,i386">Binary upgrades between RELEASE versions
 116       (and snapshots of the various security branches) are supported
 117       using the &man.freebsd-update.8; utility.  The binary upgrade
 118       procedure will update unmodified userland utilities, as well as
 119       unmodified GENERIC kernels distributed as a part of an official
 120       &os; release.  The &man.freebsd-update.8; utility requires that
 121       the host being upgraded have Internet connectivity.</para>
 122
 123     <para>Source-based upgrades (those based on recompiling the &os;
 124       base system from source code) from previous versions are
 125       supported, according to the instructions in
 126       <filename>/usr/src/UPDATING</filename>.</para>
 127
 128     <important>
 129       <para>Upgrading &os; should only be attempted after backing up
 130         <emphasis>all</emphasis> data and configuration files.</para>
 131     </important>
 132   </sect1>
 133
 134   <sect1 xml:id="security-errata">
 135     <title>Security and Errata</title>
 136
 137     <para>This section lists the various Security Advisories and
 138       Errata Notices since &release.prev;.</para>
 139
 140     <sect2 xml:id="security">
 141       <title>Security Advisories</title>
 142
 143       &security;
 144     </sect2>
 145
 146     <sect2 xml:id="errata">
 147       <title>Errata Notices</title>
 148
 149       &errata;
 150     </sect2>
 151   </sect1>
 152
 153   <sect1 xml:id="userland">
 154     <title>Userland</title>
 155
 156     <para>This section covers changes and additions to userland
 157       applications, contributed software, and system utilities.</para>
 158
 159     <sect2 xml:id="userland-config">
 160       <title>Userland Configuration Changes</title>
 161
 162       <para revision="266463">The default &man.newsyslog.conf.5; now
 163         includes files in the
 164         <filename>/etc/newsyslog.conf.d/</filename> and
 165         <filename>/usr/local/etc/newsyslog.conf.d/</filename>
 166         directories by default for &man.newsyslog.8;.</para>
 167
 168       <para revision="270675">The &man.mailwrapper.8; utility has been
 169         updated to use &man.mailer.conf.5; from the
 170         <literal>LOCALBASE</literal> environment variable, which
 171         defaults to <filename class="directory">/usr/local</filename>
 172         if unset.</para>
 173
 174       <para revision="272350">The <literal>MK_ARM_EABI</literal>
 175         &man.src.conf.5; option has been removed.</para>
 176     </sect2>
 177
 178     <sect2 xml:id="userland-programs">
 179       <title>Userland Application Changes</title>
 180
 181       <para revision="258838" contrib="sponsor" sponsor="&ff;,
 182         &google;" sponsorurl="">The &man.casperd.8; daemon has been
 183         added, which provides access to functionality that is not
 184         available in the <quote>capability mode</quote>
 185         sandbox.</para>
 186
 187       <para revision="260594">When unable to load a kernel module with
 188         &man.kldload.8;, a message informing to view output of
 189         &man.dmesg.8; is now printed, opposed to the previous output
 190         <quote>Exec format error.</quote>.</para>
 191
 192       <para revision="260910">Allow &man.pciconf.8; to identify PCI
 193         devices that are attached to a driver to be identified by
 194         their device name instead of just the selector.  Additionally,
 195         an optional device argument to the <literal>-l</literal> flag
 196         to restrict the output to only listing details about a single
 197         device.</para>
 198
 199       <para revision="260913">A new flag, <quote>onifconsole</quote>
 200         has been added to <filename>/etc/ttys</filename>.  This allows
 201         the system to provide a login prompt via serial console if the
 202         device is an active kernel console, otherwise it is equivalent
 203         to <literal>off</literal>.</para>
 204
 205       <para revision="260926">Support for displaying VPD for PCI
 206         devices via &man.pciconf.8; has been added.</para>
 207
 208       <para revision="261498">&man.ping.8; protects against malicious
 209         network packets using the Capsicum framework to drop
 210         privileges.</para>
 211
 212       <para revision="265229">The &man.ps.1; utility has been
 213         updated to include the <literal>-J</literal> flag, used to
 214         filter output by matching &man.jail.8; IDs and names.
 215         Additionally, argument <literal>0</literal> can be used to
 216         <literal>-J</literal> to only list processes running on the
 217         host system.</para>
 218
 219       <para revision="265249">The &man.top.1; utility has been updated
 220         to filter by &man.jail.8; ID or name, in followup to the
 221         &man.ps.1; change in <literal>r265229</literal>.</para>
 222
 223       <para revision="266209">The &man.pmcstat.8; utility has been
 224         updated to include a new flag, <literal>-l</literal>, which
 225         ends event collection after the specified number of
 226         seconds.</para>
 227
 228       <para revision="270745">The &man.ps.1; utility has been updated
 229         to include a new keyword, <quote>tracer</quote>, which
 230         displays the <acronym>PID</acronym> of the tracing
 231         process.</para>
 232
 233       <para revision="271482">Support for adding empty partitions has
 234         been added to the &man.mkimg.1; utility.</para>
 235
 236       <para revision="272166">The &man.primes.6; utility has been
 237         updated to correctly enumerate prime numbers between
 238         <literal>4295098369</literal> and
 239         <literal>3825123056546413050</literal>, which prior to this
 240         change, it would be possible for returned values to be
 241         incorrectly identified as prime numbers.</para>
 242
 243       <para revision="272198">The &man.mkimg.1; utility has been
 244         updated to include three options used to print information
 245         about &man.mkimg.1; itself:</para>
 246
 247       <informaltable frame="none" pgwide="0">
 248         <tgroup cols="2">
 249           <colspec colwidth="1*"/>
 250           <colspec colwidth="1*"/>
 251           <thead>
 252             <row>
 253               <entry>Option</entry>
 254               <entry>Output</entry>
 255             </row>
 256           </thead>
 257
 258           <tbody>
 259             <row>
 260               <entry><literal>--version</literal></entry>
 261               <entry>The current version of the &man.mkimg.1;
 262                 utility</entry>
 263             </row>
 264
 265             <row>
 266               <entry><literal>--formats</literal></entry>
 267               <entry>The disk image file formats supported by
 268                 &man.mkimg.1;</entry>
 269             </row>
 270
 271             <row>
 272               <entry><literal>--schemes</literal></entry>
 273               <entry>The partition schemes supported by
 274                 &man.mkimg.1;</entry>
 275             </row>
 276           </tbody>
 277         </tgroup>
 278       </informaltable>
 279
 280       <para revision="272488">Userland &man.ctf.5; support in
 281         &man.dtrace.1; has been added.  With this change,
 282         &man.dtrace.1; is able to resolve type info for function and
 283         <acronym>USDT</acronym> probe arguments, and function return
 284         values.</para>
 285
 286       <para revision="274960">The &man.elfdump.1; utility has been
 287         updated to support capability mode provided by
 288         &man.capsicum.4;.</para>
 289
 290       <para revision="275680" contrib="sponsor" sponsor="&ff;">The
 291         &man.fstyp.8; utility has been added, which is used to
 292         determine the filesystem on a specified device.</para>
 293
 294       <para revision="276881">The <literal>libedit</literal> library
 295         has been updated to support <acronym>UTF</acronym>-8, which
 296         additionally provides unicode support to &man.sh.1;.</para>
 297
 298       <para revision="277166" arch="powerpc">The &man.ptrace.2; system
 299         call has been updated include support for Altivec registers on
 300         &os;/&arch.powerpc;.</para>
 301
 302       <para revision="278320">A new device control utility,
 303         &man.devctl.8; has been added, which allows making
 304         administrative changes to individual devices, such as
 305         attaching and detaching drivers, and enabling and disabling
 306         devices.  The &man.devctl.8; utility uses the new
 307         &man.devctl.3; library.</para>
 308
 309       <para revision="279315" contrib="sponsor" sponsor="&ff;">The
 310         &man.uefisign.8; utility has been added.</para>
 311
 312       <para revision="279571" contrib="sponsor"
 313         sponsor="&scaleengine;">The &man.freebsd-update.8; utility has
 314         been updated to prevent fetching updated binary patches when
 315         a previous upgrade has not been thoroughly completed.</para>
 316
 317       <para revision="279122" contrib="sponsor"
 318         sponsor="&juniper;">The &man.netstat.1; utility has been
 319         updated to link against the &man.libxo.3; shared
 320         library.</para>
 321
 322       <para revision="280870">A regression in the &man.libarchive.3;
 323         library that would prevent a directory from being included in
 324         the archive when <literal>--one-file-system</literal> is used
 325         has been fixed.</para>
 326
 327       <para revision="281311" contrib="sponsor" sponsor="&ff;">The
 328         &man.ar.1; utility has been updated to set
 329         <literal>ARCHIVE_EXTRACT_SECURE_SYMLINKS</literal> and
 330         <literal>ARCHIVE_EXTRACT_SECURE_NODOTDOT</literal> to disallow
 331         directory traversal when extracting an archive, similar to
 332         &man.tar.1;.</para>
 333
 334       <para revision="282208" contrib="sponsor"
 335         sponsor="&multiplay;">The &man.chflags.1;, &man.chgrp.1;,
 336         &man.chmod.1;, and &man.chown.8; utilities now affect symbolic
 337         links when the <literal>-R</literal> flag is specified, as
 338         documented in &man.symlink.7;.</para>
 339
 340       <para revision="281617">A race condition in &man.wc.1; that
 341         would cause final results to be sent to &man.stderr.4; when
 342         receiving the <literal>SIGINFO</literal> signal has been
 343         fixed.</para>
 344
 345       <para revision="284297" contrib="sponsor"
 346         sponsor="&clusterhq;">The &man.lockstat.1; utility has been
 347         updated with several improvements:</para>
 348
 349       <itemizedlist>
 350         <listitem>
 351           <para>Spin locks are now reported as the amount of time
 352             spinning, instead of loop iterations.</para>
 353         </listitem>
 354
 355         <listitem>
 356           <para>Reader locks are now recognized as adaptive and can
 357             spin on &os;.</para>
 358         </listitem>
 359
 360         <listitem>
 361           <para>Lock aquisition events for successful reader try-lock
 362             events are now reported.</para>
 363         </listitem>
 364
 365         <listitem>
 366           <para>Spin-and-block events that occur before lock
 367             acquisition are now reported.</para>
 368         </listitem>
 369       </itemizedlist>
 370
 371       <para revision="284589" contrib="sponsor"
 372         sponsor="&scaleengine;">The &man.fstyp.8; utility has been
 373         updated to be able to detect &man.zfs.8; and &man.geli.8;
 374         filesystems.</para>
 375     </sect2>
 376
 377     <sect2 xml:id="userland-contrib">
 378       <title>Contributed Software</title>
 379
 380       <para revision="258884" contrib="sponsor"
 381         sponsor="&darpa_afrl;">&man.lldb.1; has been updated to
 382         upstream snapshot version r196259.</para>
 383
 384       <para revision="259626">Timezone data files have been updated to
 385         version 2013i.</para>
 386
 387       <para revision="260445">&man.byacc.1; has been updated to
 388         version 20140101.</para>
 389
 390       <para revision="261071">&man.jemalloc.3; has been updated to
 391         version 3.5.0.</para>
 392
 393       <para revision="261283"><application>libc++</application> has
 394         been updated to version 3.4.</para>
 395
 396       <para revision="261320"><application>OpenSSH</application> has
 397         been updated to 6.5p1.</para>
 398
 399       <para revision="261344"><application>mdocml</application> has
 400         been updated to version 1.12.3.</para>
 401
 402       <para revision="261991"><application>LLVM</application> and
 403         <application>Clang</application> have been updated to
 404         version 3.4.</para>
 405
 406       <para revision="266527"
 407         role="merged"><application>Sendmail</application> has been
 408         updated from 8.14.7 to 8.14.9.</para>
 409
 410       <para revision="276577"><application>file</application> has been
 411         updated to version 5.22.</para>
 412
 413       <para revision="275718">The <application>binutils</application>
 414         suite of utilities has been updated to include upstream
 415         patches that add new relocations for &arch.powerpc;
 416         support.</para>
 417
 418       <para revision="276398" contrib="sponsor" sponsor="&ff;">The
 419         <application>ELF Tool Chain</application> has been updated to
 420         upstream revision r3136.</para>
 421
 422       <para revision="276551">The <application>texinfo</application>
 423         utility and <literal>info</literal> pages were removed from
 424         the base system.  The <filename
 425           role="package">print/texinfo</filename> port should be
 426         installed on systems where <literal>info</literal> pages are
 427         needed.</para>
 428
 429       <para revision="276796" contrib="sponsor" sponsor="&ff;">The ELF
 430         object manipulation tools
 431         <application>addr2line</application>,
 432         <application>elfcopy (strip)</application>,
 433         <application>nm</application>,
 434         <application>readelf</application>,
 435         <application>size</application>, and
 436         <application>strings</application> were switched to the
 437         versions from the ELF Tool Chain project.</para>
 438
 439       <para revision="276881">The <literal>libedit</literal> library
 440         has been updated to include <acronym>UTF-8</acronym> support,
 441         adding <acronym>UTF-8</acronym> support to the &man.sh.1;
 442         shell.</para>
 443
 444       <para revision="278433">The &man.xz.1; utility has been updated
 445         to support multi-threaded compression.</para>
 446
 447       <para revision="280297"><application>OpenSSL</application> has
 448         been updated to version 1.0.1m.</para>
 449
 450       <para revision="280932" contrib="sponsor" sponsor="&ff;">The
 451         <application>elftoolchain</application> utilities have been
 452         updated to version 3179.</para>
 453
 454       <para revision="281316">The &man.xz.1; utility has been updated
 455         to version 5.2.1.</para>
 456
 457       <para revision="281373">The &man.nvi.1; utility has been updated
 458         to version 2.1.3.</para>
 459
 460       <para revision="281396">The &man.acpi.4; subsystem has been
 461         updated to version 20150410.</para>
 462
 463       <para revision="281806">The &man.wpa.supplicant.8; and
 464         &man.hostapd.8; utilities have been updated to version
 465         2.4.</para>
 466
 467       <para revision="282089">The &man.unbound.8; utility has been
 468         updated to version 1.5.3.</para>
 469
 470       <para revision="282434" contrib="sponsor" sponsor="&ff;">The
 471         &man.resolvconf.8; utility has been updated to version
 472         3.7.0.</para>
 473
 474       <para revision="284254"><application>bmake</application> has
 475         been updated to version 20150606.</para>
 476     </sect2>
 477
 478     <sect2 xml:id="userland-installer">
 479       <title>Installation and Configuration Tools</title>
 480
 481       <para revision="271539">The &man.bsdinstall.8; partition editor
 482         and &man.sade.8; utility have been updated to include native
 483         <acronym>ZFS</acronym> support.</para>
 484
 485       <para revision="272274">The &os; installation utility,
 486         &man.bsdinstall.8;, has been updated to set the
 487         <literal>canmount</literal> &man.zfs.8; property to
 488         <literal>off</literal> for the <filename
 489           class="directory">/var</filename> dataset, preventing the
 490         contents of directories within <filename
 491           class="directory">/var</filename> from conflicting when
 492         using multiple boot environments, such as that provided by
 493         <filename role="package">sysutils/beadm</filename>.</para>
 494
 495       <para revision="274394">The &man.bsdconfig.8; utility has been
 496         updated to skip the initial &man.tzsetup.8;
 497         <acronym>UTC</acronym> versus wall-clock time prompt when run
 498         in a virtual machine, determined when the
 499         <literal>kern.vm_guest</literal> &man.sysctl.8; is set to
 500         <literal>1</literal>.</para>
 501
 502       <para revision="275874">The &man.bsdinstall.8; utility has been
 503         updated to use the new &man.dpv.3; library to display progress
 504         when extracting the &os; distributions.</para>
 505     </sect2>
 506
 507     <sect2 xml:id="userland-rc">
 508       <title><filename class="directory">/etc/rc.d</filename>
 509         Scripts</title>
 510
 511       <para revision="270676">The &man.rc.8; subsystem has been
 512         updated to allow configuring services in <filename
 513           class="directory">&dollar;{LOCALBASE}/etc/rc.conf.d/</filename>.
 514         If <literal>LOCALBASE</literal> is unset, it defaults to
 515         <filename class="directory">/usr/local</filename>.</para>
 516
 517       <para revision="275299">The <filename>mrouted</filename>
 518         &man.rc.8; script has been removed from the base system.  An
 519         equivalent script is available from the <filename
 520           role="package">net/mrouted</filename> port.</para>
 521
 522       <para revision="279463" contrib="sponsor"
 523         sponsor="&sandvine;">A new &man.rc.8; script,
 524         <filename>iovctl</filename>, has been added, which allows
 525         automatically starting the &man.iovctl.8; utility at
 526         boot.</para>
 527     </sect2>
 528
 529     <sect2 xml:id="userland-periodic">
 530       <title><filename class="directory">/etc/periodic</filename>
 531         Scripts</title>
 532
 533       <para revision="271321">The daily &man.periodic.8; script
 534         <filename>110.clean-tmps</filename> has been updated to avoid
 535         crossing filesystem mount boundaries when cleaning files in
 536         <filename class="directory">/tmp</filename>.</para>
 537     </sect2>
 538
 539     <sect2 xml:id="userland-libraries">
 540       <title>Runtime Libraries and API</title>
 541
 542       <para revision="265995">The Blowfish &man.crypt.3; default
 543         format has been changed to
 544         <literal>&dollar;2b&dollar;</literal>.</para>
 545
 546       <para revision="268461">The &man.readline.3; library is now
 547         statically linked in software within the base system, and the
 548         shared library is no longer installed, allowing the Ports
 549         Collection to use a modern version of the library.</para>
 550
 551       <para revision="272273">The &man.strptime.3; library has been
 552         updated to add support for <acronym>POSIX</acronym>-2001
 553         features <literal>%U</literal> and
 554         <literal>%W</literal>.</para>
 555
 556       <para revision="272842,272848" contrib="sponsor"
 557         sponsor="&ff;">The &man.dl.iterate.phdr.3; library has been
 558         changed to always return the path name of the
 559         <acronym>ELF</acronym> object in the
 560         <literal>dlpi_name</literal> structure member.</para>
 561
 562       <para revision="273562" contrib="sponsor"
 563         sponsor="&juniper;">The &man.libxo.3; library has been
 564         imported to the base system.</para>
 565
 566       <para revision="273806" contrib="sponsor" sponsor="&chelsio;">A
 567         userland library for Chelsio Terminator 5 based iWARP cards
 568         has been added, allowing userland <acronym>RDMA</acronym>
 569         applications to work over compatible
 570         <acronym>NIC</acronym>s.</para>
 571
 572       <para revision="274987">The &man.gpio.3; library has been added,
 573         providing a wrapper around the &man.gpio.4; kernel
 574         interface.</para>
 575
 576       <para revision="277610">The <literal>futimens()</literal> and
 577         <literal>utimensat()</literal> system calls have been
 578         added.  See &man.utimensat.2; for more information.</para>
 579
 580       <para revision="278934">The &man.elf.3; compile-time dependency
 581         has been removed from <filename>dtri.o</filename>, which
 582         allows adding <application>DTrace</application> probes to
 583         userland applications and libraries without also linking
 584         against &man.elf.3;.</para>
 585
 586       <para revision="279186">The &man.setmode.3; function has been
 587         updated to consistently set <literal>errno</literal> on
 588         failure.</para>
 589
 590       <para revision="279663">The &man.qsort.3; functions have been
 591         updated to be able to handle 32-bit aligned data on 64-bit
 592         platforms, also providing a significant improvement in 32-bit
 593         workloads.</para>
 594
 595       <para revision="281130">Several standard include headers have
 596         been updated to use of <application>gcc</application>
 597         attributes, such as <literal>__result_use_check()</literal>,
 598         <literal>__alloc_size()</literal>, and
 599         <literal>__nonnull()</literal>.</para>
 600
 601       <para revision="281845">Support for file verification in
 602         <acronym>MAC</acronym> has been added.</para>
 603
 604       <para revision="282973" contrib="sponsor" sponsor="&ff;">The
 605         <literal>libgomp</literal> library is now only built when
 606         building <acronym>GCC</acronym> from the base system.  An
 607         up-to-date version is available in the Ports Collection as
 608         <filename
 609           role="package">devel/libiomp5-devel</filename>.</para>
 610
 611       <para revision="282988">The <filename>stdlib.h</filename> and
 612         <filename>malloc.h</filename> headers have been updated to
 613         make use of the <application>gcc</application>
 614         <literal>alloc_align()</literal> attribute.</para>
 615
 616       <para revision="284483" contrib="sponsor"
 617         sponsor="&scaleengine;">The Blowfish &man.crypt.3; library
 618         has been updated to support &dollar;2y&dollar; hashes.</para>
 619     </sect2>
 620
 621     <sect2 xml:id="userland-abi">
 622       <title>ABI Compatibility</title>
 623
 624       <para revision="271982">The &linux; compatibility version has
 625         been updated to <literal>2.6.18</literal>.  The
 626         <literal>compat.linux.osrelease</literal> &man.sysctl.8; is
 627         evaluated when building the <filename
 628           role="package">emulators/linux-c6</filename> and related
 629         ports.</para>
 630     </sect2>
 631   </sect1>
 632
 633   <sect1 xml:id="kernel">
 634     <title>Kernel</title>
 635
 636     <para>This section covers changes to kernel configurations, system
 637       tuning, and system control parameters that are not otherwise
 638       categorized.</para>
 639
 640     <sect2 xml:id="kernel-bugfix">
 641       <title>Kernel Bug Fixes</title>
 642
 643       <para revision="265876">A kernel bug that inhibited proper
 644         functionality of the <literal>dev.cpu.0.freq</literal>
 645         &man.sysctl.8; on &intel; processors with Turbo
 646         Boost&nbsp;&trade; enabled has been fixed.</para>
 647
 648       <para revision="271697" arch="powerpc">Support for
 649         &man.dtrace.1; stack tracing has been fixed for
 650         &os;/&arch.powerpc;, using the <literal>trapexit()</literal>
 651         and <literal>asttrapexit()</literal> functions instead of
 652         checking within addressed kernel space.</para>
 653
 654       <para revision="272089">A bug in &man.ipfw.4; that could
 655         potentially lead to a kernel panic when using &man.dummynet.4;
 656         at layer 2 has been fixed.</para>
 657
 658       <para revision="280930" contrib="sponsor" sponsor="&mitail;">The
 659         kernel <acronym>RPC</acronym> has been updated to include
 660         several enhancements:</para>
 661
 662       <itemizedlist>
 663         <listitem>
 664           <para>The 45 MiB limit on requests queued for
 665             &man.nfsd.8; threads has been removed.</para>
 666         </listitem>
 667
 668         <listitem>
 669           <para>Avoids unnecessary throttling by not deferring
 670             accounting for completed requests.</para>
 671         </listitem>
 672
 673         <listitem>
 674           <para>Fixes an integer overflow and signedness bugs.</para>
 675         </listitem>
 676       </itemizedlist>
 677
 678       <para revision="281261" arch="powerpc">Support for
 679         &man.dtrace.1; has been added for the
 680         Book-E&nbsp;&trade;.</para>
 681     </sect2>
 682
 683     <sect2 xml:id="kernel-config">
 684       <title>Kernel Configuration</title>
 685
 686       <para revision="266531">The <literal>IMAGACT_BINMISC</literal>
 687         kernel configuration option has been enabled by default,
 688         which enables application execution through emulators, such
 689         as <application>Qemu</application>.</para>
 690
 691       <para revision="268045">The <literal>VT</literal> kernel
 692         configuration file has been removed, and the &man.vt.4;
 693         driver is included in the <literal>GENERIC</literal> kernel.
 694         To enable &man.vt.4;, enter <literal>set kern.vty=vt</literal>
 695         at the &man.loader.8; prompt during boot, or add
 696         <literal>kern.vty=vt</literal> to &man.loader.conf.5; and
 697         reboot the system.</para>
 698
 699       <para revision="277904">The &man.config.8; utility has been
 700         updated to allow using a non-standard <filename
 701           class="directory">src/</filename> tree, specified as an
 702         argument to the <literal>-s</literal> flag.</para>
 703
 704       <para revision="277990" arch="powerpc64">The
 705         &os;/&arch.powerpc64; kernel now builds as
 706         a position-independent executable, allowing the kernel to be
 707         loaded into and run from any physical or virtual
 708         address.</para>
 709
 710       <important>
 711         <para>This change requires an update to &man.loader.8;.
 712           The userland and kernel must be updated before rebooting the
 713           system.</para>
 714       </important>
 715
 716       <para revision="279189" contrib="sponsor" sponsor="&ff;"
 717         arch="powerpc">Kernel support for Vector-Scalar eXtension
 718         (<acronym>VSX</acronym>) found on POWER7 and POWER8 hardware
 719         has been added.</para>
 720
 721       <para revision="279252" contrib="sponsor" sponsor="&ff;"
 722         arch="powerpc">The &man.pmap.9; implementation for 64-bit
 723         &powerpc; processors has been overhaulded to improve
 724         concurrency.</para>
 725
 726       <para revision="283959" contrib="sponsor"
 727         sponsor="&limelight;">A new kernel configuration option,
 728         <literal>EM_MULTIQUEUE</literal>, has been added which enables
 729         multi-queue support in the &man.em.4; driver.</para>
 730
 731       <note>
 732         <para>Multi-queue support in the &man.em.4; driver is not
 733           officially supported by &intel;.</para>
 734       </note>
 735     </sect2>
 736
 737     <sect2 xml:id="kernel-sysctl">
 738       <title>System Tuning and Controls</title>
 739
 740       <para revision="275140" contrib="sponsor" sponsor="&ff;">The
 741         &man.hwpmc.4; default and maximum callchain depths have been
 742         increased.  The default has been increased from 16 to 32, and
 743         the maximum increased from 32 to 128.</para>
 744
 745       <para revision="279361">The <literal>kern.osrelease</literal>
 746         and <literal>kern.osreldate</literal> are now configurable
 747         &man.jail.8; parameters.</para>
 748
 749       <para revision="280308,280949" contrib="sponsor"
 750         sponsor="&ix;, &ff;">The &man.devfs.5; device filesystem has
 751         been changed to update timestamps for read/write operations
 752         using seconds precision.  A new &man.sysctl.8;,
 753         <literal>vfs.devfs.dotimes</literal> has been added, which
 754         when set to a non-zero value, enables default precision
 755         timestamps for these operations.</para>
 756
 757       <para revision="282213" contrib="sponsor" sponsor="&ff;">A new
 758         &man.sysctl.8;, <literal>kern.racct.enable</literal>, has been
 759         added, which when set to a non-zero value allows using
 760         &man.rctl.8; with the <literal>GENERIC</literal> kernel.
 761         A new kernel configuration option,
 762         <literal>RACCT_DISABLED</literal> has also been added.</para>
 763
 764       <para revision="282901" contrib="sponsor" sponsor="&ff;">The
 765         <literal>GENERIC</literal> kernel configuration now includes
 766         <literal>RACCT</literal> and <literal>RCTL</literal> by
 767         default.</para>
 768
 769       <note>
 770         <para>To enable <literal>RACCT</literal> and
 771           <literal>RCTL</literal> on a system using the
 772           <literal>GENERIC</literal> kernel configuration, add
 773           <literal>kern.racct.enable=1</literal> to
 774           &man.loader.conf.5;, and reboot the system.</para>
 775       </note>
 776
 777       <para revision="283136" contrib="sponsor"
 778         sponsor="&limelight;">A new &man.sysctl.8;,
 779         <literal>net.inet.tcp.hostcache.purgenow</literal>, has
 780         been added, which when set to <literal>1</literal> during
 781         runtime will flush all
 782         <literal>net.inet.tcp.hostcache</literal> entries.</para>
 783     </sect2>
 784   </sect1>
 785
 786   <sect1 xml:id="drivers">
 787     <title>Devices and Drivers</title>
 788
 789     <para>This section covers changes and additions to devices and
 790       device drivers since &release.prev;.</para>
 791
 792     <sect2 xml:id="drivers-device">
 793       <title>Device Drivers</title>
 794
 795       <para revision="260903">Support for GPS ports has been added to
 796         &man.uhso.4;.</para>
 797
 798       <para revision="265132">The &man.full.4; device has been added,
 799         and the <literal>lindev(4)</literal> device has been removed.
 800         Prior to this change, <literal>lindev(4)</literal> provided
 801         only the <filename>/dev/full</filename> character device,
 802         returning <literal>ENOSPC</literal> on write attempts.  As
 803         this device is not specific to &linux;, a native &os; version
 804         has been added.</para>
 805
 806       <para revision="271705">Hardware context support has been
 807         added to the <literal>drm/i915</literal> driver, adding
 808         support for <application>Mesa</application> 9.2 and
 809         later.</para>
 810
 811       <para revision="273178">The &man.vt.4; driver has been updated,
 812         replacing the bitmapped <literal>kern.vt.spclkeys</literal>
 813         &man.sysctl.8; with individual
 814         <literal>kern.vt.kbd_*</literal> variants.</para>
 815
 816       <para revision="273598">The &man.hpet.4; driver has been updated
 817         to create a
 818         <filename>/dev/hpet<replaceable>N</replaceable></filename>
 819         device, providing access to <acronym>HPET</acronym> from
 820         userspace.</para>
 821
 822       <para revision="280183">The <literal>drm</literal> code has
 823         been updated to match &linux; version 3.8.13.</para>
 824
 825       <para revision="282783" arch="powerpc">Support for the Freescale
 826         <acronym>PCI</acronym> Root Complex device has been
 827         added.</para>
 828     </sect2>
 829
 830     <sect2 xml:id="drivers-storage">
 831       <title>Storage Drivers</title>
 832
 833       <para revision="265236" contrib="sponsor"
 834         sponsor="&lsi;, &spectralogic;" sponsorurl="">The &man.mpr.4;
 835         device has been added, providing support for LSI Fusion-MPT
 836         3 12Gb SCSI/SATA controllers.</para>
 837
 838       <para revision="265555" contrib="sponsor"
 839           sponsor="&lsi;">The &man.mrsas.4; driver has been added,
 840         providing support for LSI MegaRAID SAS controllers.  The
 841         &man.mfi.4; driver will attach to the controller, by default.
 842         To enable &man.mrsas.4; add
 843         <literal>hw.mfi.mrsas_enable=1</literal> to
 844         <filename>/boot/loader.conf</filename>, which turns off
 845         &man.mfi.4; device probing.</para>
 846
 847       <note>
 848         <para>At this time, the &man.mfiutil.8; utility and the &os;
 849           version of <application>MegaCLI</application> and
 850           <application>StorCli</application> do not work with
 851           &man.mrsas.4;.</para>
 852       </note>
 853
 854       <para revision="275461" contrib="sponsor" sponsor="&ix;">The
 855         &man.ctl.4; subsystem has been updated, increasing the ports
 856         limit from <literal>128</literal> to <literal>256</literal>,
 857         and <acronym>LUN</acronym> limit from <literal>256</literal>
 858         to <literal>1024</literal>.</para>
 859
 860       <para revision="276526">The <literal>asr(4)</literal> driver has
 861         been removed, and is no longer supported.</para>
 862
 863       <para revision="281387">The &man.hptnr.4; driver has been
 864         updated to version 1.1.1.</para>
 865     </sect2>
 866
 867     <sect2 xml:id="drivers-network">
 868       <title>Network Drivers</title>
 869
 870       <para revision="258830">Support for Broadcom chipsets BCM57764,
 871         BCM57767, BCM57782, BCM57786 and BCM57787 has been added to
 872         &man.bge.4;.</para>
 873
 874       <para revision="260448">Support for the &intel; Centrino&trade;
 875         Wireless-N 135 chipset has been added.</para>
 876
 877       <para revision="260552">Firmware for &intel; Centrino&trade;
 878         Wireless-N 105 devices has been added to the base
 879         system.</para>
 880
 881       <para revision="261975">The deprecated nve(4) driver has been
 882         removed.  Users of NVIDIA nForce MCP network adapters are
 883         advised to use the &man.nfe.4; driver instead, which has been
 884         the default driver for this hardware since
 885         &os;&nbsp;7.0.</para>
 886
 887       <para revision="264601" contrib="sponsor"
 888         sponsor="&darpa_afrl;">The <literal>if_nf10bmac(4)</literal>
 889         device has been added, providing support for NetFPGA-10G
 890         Embedded CPU Ethernet Core.</para>
 891
 892       <note>
 893         <para>The <literal>if_nf10bmac(4)</literal> driver operates on
 894           the FPGA, and is not suited for the PCI host
 895           interface.</para>
 896       </note>
 897
 898       <para revision="265348" contrib="sponsor"
 899         sponsor="&netgate;">The &man.ath.hal.4; driver has been
 900         updated to support the Atheros AR1111 chipset.</para>
 901
 902       <para revision="266770">Support for the &intel; Centrino&trade;
 903         Wireless-N 105 chipset has been added.</para>
 904
 905       <para revision="266757" contrib="sponsor"
 906         sponsor="&chelsio;">Support for the &man.cxgbe.4; Terminator
 907         5 (T5) 10G/40G cards has been added to &man.netmap.4;.</para>
 908
 909       <para revision="272730">The &man.alc.4; driver has been updated
 910         to support AR816x and AR817x ethernet controllers.</para>
 911
 912       <para revision="273331">The &man.vxlan.4; driver has been added,
 913         which creates a virtual Layer 2 (Ethernet) network overlaid in
 914         a Layer 3 (IP/UDP) network.  The &man.vxlan.4; driver is
 915         analogous to &man.vlan.4;, but is designed to be better suited
 916         for large, multiple-tenant datacenter environments.</para>
 917
 918       <para revision="274246" contrib="sponsor" sponsor="&yandex;">The
 919         &man.gre.4; driver has been significantly overhauled, and has
 920         been split into two separate modules, &man.gre.4; and
 921         &man.me.4;.</para>
 922
 923       <para revision="283766" contrib="sponsor"
 924         sponsor="&limelight;">The &man.em.4; driver has been updated
 925         with improved transmission queue hang detection.</para>
 926     </sect2>
 927   </sect1>
 928
 929   <sect1 xml:id="hardware">
 930     <title>Hardware Support</title>
 931
 932     <para>This section covers general hardware support for physical
 933       machines, hypervisors, and virtualization environments, as well
 934       as hardware changes and updates that do not otherwise fit in
 935       other sections of this document.</para>
 936
 937     <sect2 xml:id="hardware-support">
 938       <title>Hardware Support</title>
 939
 940       <para revision="268303">The &man.asmc.4; driver has been
 941         updated to support the &apple;&nbsp;MacMini 3,1.</para>
 942
 943       <para revision="268351">Support for &os;/ia64 has been dropped
 944         as of &os;&nbsp;11.</para>
 945
 946       <para revision="274386">An issue that could cause a system to
 947         hang when entering <acronym>ACPI</acronym>
 948         <literal>S3</literal> state (suspend to
 949         <acronym>RAM</acronym>) has been corrected in the &man.acpi.4;
 950         and &man.pci.4; drivers.</para>
 951
 952       <para revision="274733" arch="powerpc">The power management unit
 953         subsystem has been updated to support power button events on
 954         certain &arch.powerpc; hardware, such as aluminum
 955         PowerBook&nbsp;&reg;.</para>
 956
 957       <para revision="275171,275190" arch="powerpc">The &man.hwpmc.4;
 958         driver has been updated to correct performance counter
 959         sampling on G4 (MPC74xxx) and G5 class processors.</para>
 960
 961       <para revision="281713" arch="powerpc">The &man.hwpmc.4;
 962         driver has been updated to support the Freescale e500
 963         core.</para>
 964
 965       <para revision="275732" contrib="sponsor"
 966         sponsor="&ff;,&netgate;">The
 967         <application>OpenCrypto</application> framework has been
 968         updated to include <literal>AES-ICM</literal> and
 969         <literal>AES-GCM</literal> modes, both of which have also been
 970         added to the &man.aesni.4; driver.</para>
 971
 972       <para revision="283766">The &man.ig4.4; driver has been added,
 973         providing support for the fourth generation &intel;
 974         <acronym>I2C</acronym> SMBus.</para>
 975     </sect2>
 976
 977     <sect2 xml:id="hardware-virtualization">
 978       <title>Virtualization Support</title>
 979
 980       <para revision="260410">Support for the <quote>Virtual Interrupt
 981           Delivery</quote> feature of &intel;&nbsp;VT-x is enabled if
 982         supported by the CPU.  This feature can be disabled by running
 983         <literal>sysctl hw.vmm.vmx.use_apic_vid=0</literal>.
 984         Additionally, to persist this setting across reboots, add
 985         <literal>hw.vmm.vmx.use_apic_vid=0</literal> to
 986         <filename>/etc/sysctl.conf</filename>.</para>
 987
 988       <para revision="260532">Support for <quote>Posted Interrupt
 989           Processing</quote> is enabled if supported by the CPU.  This
 990         feature can be disabled by running <literal>sysctl
 991           hw.vmm.vmx.use_apic_pir=0</literal>.  Additionally, to
 992         persist this setting across reboots, add
 993         <literal>hw.vmm.vmx.use_apic_pir=0</literal> to
 994         <filename>/etc/sysctl.conf</filename>.</para>
 995
 996       <para revision="260582">Unmapped IO support has been added to
 997         &man.virtio_blk.4;.</para>
 998
 999       <para revision="260583">Unmapped IO support has been added to
1000         &man.virtio_scsi.4;.</para>
1001
1002       <para revision="260847">The &man.virtio_random.4; driver has
1003         been added to harvest entropy from the host system.</para>
1004
1005       <para revision="261504">&os;/&arch.i386; guests can be run under
1006         bhyve.</para>
1007
1008       <para revision="267536" contrib="sponsor"
1009         sponsor="&citrix.rd;">Support for running a &os;/&arch.amd64;
1010         <application>Xen</application> guest instance as
1011         <acronym>PVH</acronym> guest has been added.
1012         <acronym>PVH</acronym> mode, short for <quote>Para-Virtualized
1013           Hardware</quote>, uses para-virtualized drivers for boot and
1014         I/O, and uses hardware virtualization extensions for all other
1015         tasks, without the need for emulation.</para>
1016
1017       <para revision="273515">The &man.virtio.console.4; driver has
1018         been added, which provides an interface to VirtIO console
1019         devices through a &man.tty.4; device.</para>
1020
1021       <para revision="279957">The &man.bhyve.8; hypervisor has been
1022         updated to support <literal>DSM TRIM</literal> commands for
1023         virtual <acronym>AHCI</acronym> disks.</para>
1024
1025       <para revision="281439" arch="arm">Support for the
1026         <application>QEMU</application> <literal>virt</literal> system
1027         has been added.</para>
1028
1029       <para revision="282212" contrib="sponsor" sponsor="&msostc;">The
1030         HyperV&trade; drivers have been updated with several
1031         enhancements:</para>
1032
1033       <itemizedlist>
1034         <listitem>
1035           <para>The &man.hv.vmbus.4; driver now has multi-channel
1036             support.</para>
1037         </listitem>
1038
1039         <listitem>
1040           <para>The &man.hv.storvsc.4; driver now has scatter/gather
1041             support, in addition to performance improvements.</para>
1042         </listitem>
1043
1044         <listitem>
1045           <para>The &man.hv.kvp.4; driver has received several bug
1046             fixes.</para>
1047         </listitem>
1048       </itemizedlist>
1049
1050       <para revision="282274">Support for &man.xen.4; para-virtualized
1051         <literal>domU</literal> kernels has been removed.</para>
1052     </sect2>
1053
1054     <sect2 xml:id="hardware-arm">
1055       <title>ARM Support</title>
1056
1057       <para revision="260921">The &man.nand.4; device is enabled for
1058         ARM devices by default.</para>
1059
1060       <para revision="273264" arch="armv6">An issue that could cause
1061         instability when detecting <acronym>SD</acronym> cards on the
1062         Raspberry Pi <acronym>SOC</acronym> has been fixed.</para>
1063
1064       <para revision="275963">The <literal>bcm2835_cpufreq</literal>
1065         driver has been added, which supports <acronym>CPU</acronym>
1066         frequency and voltage control on the Raspberry Pi
1067         <acronym>SOC</acronym>.</para>
1068
1069       <para revision="280259" contrib="sponsor" sponsor="&ff;">Initial
1070         support for the ARM AArch64 architecture has been
1071         added.</para>
1072
1073       <para revision="282779" arch="arm">Kernel support for Thumb-2
1074         has been added.</para>
1075
1076       <para revision="282827">Support for the hardware power button
1077         on the BeagleBone Black system has been added.</para>
1078
1079       <para revision="284273" contrib="sponsor"
1080         sponsor="&ff;">Initial
1081         <acronym>ACPI</acronym> support has been added for
1082         &os;/&arch.arm64;.</para>
1083     </sect2>
1084   </sect1>
1085
1086   <sect1 xml:id="storage">
1087     <title>Storage</title>
1088
1089     <para>This section covers changes and additions to file systems
1090       and other storage subsystems, both local and networked.</para>
1091
1092     <sect2 xml:id="storage-general">
1093       <title>General Storage</title>
1094
1095       <para revision="278037" contrib="sponsor" sponsor="&ix;">The
1096         &man.ctl.4; <acronym>LUN</acronym> mapping has been rewritten,
1097         replacing <acronym>iSCSI</acronym>-specific mapping mechanisms
1098         with a new mechanism that works for any port.</para>
1099
1100       <para revision="278354" contrib="sponsor" sponsor="&ix;">The
1101         &man.ctld.8; utility has been updated to allow controlling
1102         non-<acronym>iSCSI</acronym> &man.ctl.4; ports.</para>
1103     </sect2>
1104
1105     <sect2 xml:id="storage-net">
1106       <title>Networked Storage</title>
1107
1108       <para revision="270096" contrib="sponsor" sponsor="&ff;">The new
1109         filesystem automount facility, &man.autofs.5;, has been added.
1110         The new &man.autofs.5; facility is similar to that found in
1111         other &unix;-like operating systems, such as OS&nbsp;X&trade;
1112         and Solaris&trade;.  The &man.autofs.5; facility uses
1113         a &sun;-compatible &man.auto.master.5; configuration file, and
1114         is administered with the &man.automount.8; userland utility,
1115         and the &man.automountd.8; and &man.autounmountd.8;
1116         daemons.</para>
1117     </sect2>
1118
1119     <sect2 xml:id="storage-zfs">
1120       <title>ZFS</title>
1121
1122       <para revision="275748">The <literal>arc_meta_limit</literal>
1123         statistics are now visible through the
1124         <literal>kstat</literal> &man.sysctl.8;.  As a result of this
1125         change, the <literal>vfs.zfs.arc_meta_used</literal>
1126         &man.sysctl.8; has been removed, and replaced with the
1127         <literal>kstat.zfs.misc.arcstats.arc_meta_used</literal>
1128         &man.sysctl.8;.</para>
1129     </sect2>
1130
1131     <sect2 xml:id="storage-geom">
1132       <title>&man.geom.4;</title>
1133
1134       <para revision="267359">Support for the
1135         <literal>disklabel64</literal> partitioning scheme has been
1136         added to &man.gpart.8;.</para>
1137     </sect2>
1138   </sect1>
1139
1140   <sect1 xml:id="boot">
1141     <title>Boot Loader Changes</title>
1142
1143     <para>This section covers the boot loader, boot menu, and other
1144       boot-related changes.</para>
1145
1146     <sect2 xml:id="boot-loader">
1147       <title>Boot Loader Changes</title>
1148
1149       <para revision="274085">The &man.vt.4; driver has been made the
1150         default system console driver.  The &man.syscons.4; driver is
1151         still available, and can be enabled by adding
1152         <literal>kern.vty=sc</literal> in &man.loader.conf.5;.
1153         Alternatively, &man.syscons.4; can be enabled at boot time by
1154         entering <literal>set kern.vty=sc</literal> at the
1155         &man.loader.8; prompt.</para>
1156
1157       <para revision="281616">The boot loader has been updated to
1158         support entering the <acronym>GELI</acronym> passphrase before
1159         loading the kernel.  To enable this behavior, add
1160         <literal>geom_eli_passphrase_prompt="YES"</literal> to
1161         &man.loader.conf.5;.</para>
1162     </sect2>
1163
1164     <sect2 xml:id="boot-menu">
1165       <title>Boot Menu Changes</title>
1166
1167       <para>&nbsp;</para>
1168     </sect2>
1169   </sect1>
1170
1171   <sect1 xml:id="network">
1172     <title>Networking</title>
1173
1174     <para>This section describes changes that affect networking in
1175       &os;.</para>
1176
1177     <sect2 xml:id="network-protocols">
1178       <title>Network Procols</title>
1179
1180       <para revision="263140">Support for the IPX network transport
1181         protocol has been removed, and will not be supported in
1182         &os;&nbsp;11 and later releases.</para>
1183
1184       <para revision="272720" contrib="sponsor"
1185         sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
1186         blackhole detection (<acronym>RFC</acronym> 4821) has been
1187         added to the &man.tcp.4; stack, disabled by default.  New
1188         control tunables have been added:</para>
1189
1190       <informaltable frame="none" pgwide="0">
1191         <tgroup cols="2">
1192           <colspec colwidth="1*"/>
1193           <colspec colwidth="1*"/>
1194           <thead>
1195             <row>
1196               <entry>Tunable</entry>
1197               <entry>Description</entry>
1198             </row>
1199           </thead>
1200
1201           <tbody>
1202             <row>
1203               <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
1204               <entry>Enables or disables <acronym>PLPMTUD</acronym>
1205                 blackhole detection</entry>
1206             </row>
1207
1208             <row>
1209               <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
1210               <entry><acronym>MSS</acronym> to try for IPv4</entry>
1211             </row>
1212
1213             <row>
1214               <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
1215               <entry><acronym>MSS to try for IPv6</acronym></entry>
1216             </row>
1217           </tbody>
1218         </tgroup>
1219       </informaltable>
1220
1221       <para>New monitoring &man.sysctl.8;s haven been added:</para>
1222
1223       <informaltable frame="none" pgwide="0">
1224         <tgroup cols="2">
1225           <colspec colwidth="1*"/>
1226           <colspec colwidth="1*"/>
1227           <thead>
1228             <row>
1229               <entry>Tunable</entry>
1230               <entry>Description</entry>
1231             </row>
1232           </thead>
1233
1234           <tbody>
1235             <row>
1236               <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
1237               <entry>Number of times the code was activated to attempt
1238                 downshifting the <acronym>MSS</acronym></entry>
1239             </row>
1240
1241             <row>
1242               <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
1243               <entry>Number of times the blackhole
1244                 <acronym>MSS</acronym> was used in an attempt to
1245                 downshift</entry>
1246             </row>
1247
1248             <row>
1249               <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
1250               <entry>Number of times that the blackhole failed to
1251                 connect after downshifting the
1252                 <acronym>MSS</acronym></entry>
1253             </row>
1254           </tbody>
1255         </tgroup>
1256       </informaltable>
1257
1258       <para revision="280971" contrib="sponsor"
1259         sponsor="&netflix;, &nginx;">Support for <acronym>IP</acronym>
1260         identification for atomic datagrams (<acronym>RFC</acronym>
1261         6864) has been added.  Support for this feature can be toggled
1262         with the <literal>net.inet.ip.rfc6864</literal>
1263         &man.sysctl.8;, which is enabled by default.</para>
1264     </sect2>
1265   </sect1>
1266
1267   <sect1 xml:id="ports">
1268     <title>Ports Collection and Package Infrastructure</title>
1269
1270     <para>This section covers changes to the &os;&nbsp;Ports
1271       Collection, package infrastructure, and package maintenance and
1272       installation tools.</para>
1273
1274     <sect2 xml:id="ports-infrastructure">
1275       <title>Infrastructure Changes</title>
1276
1277       <para>&nbsp;</para>
1278     </sect2>
1279
1280     <sect2 xml:id="ports-packages ">
1281       <title>Packaging Changes</title>
1282
1283       <para>&nbsp;</para>
1284     </sect2>
1285   </sect1>
1286
1287   <sect1 xml:id="doc">
1288     <title>Documentation</title>
1289
1290     <para>This section covers changes to the &os;&nbsp;Documentation
1291       Project sources and toolchain.</para>
1292
1293     <sect2 xml:id="doc-sources">
1294       <title>Documentation Source Changes</title>
1295
1296       <para>&nbsp;</para>
1297     </sect2>
1298
1299     <sect2 xml:id="doc-toolchain">
1300       <title>Documentation Toolchain Changes</title>
1301
1302       <para>&nbsp;</para>
1303     </sect2>
1304   </sect1>
1305
1306   <sect1 xml:id="releng">
1307     <title>Release Engineering and Integration</title>
1308
1309     <para>This section convers changes that are specific to the
1310       &os;&nbsp;Release Engineering processes.</para>
1311
1312     <sect2 xml:id="releng-changes">
1313       <title>Integration Changes</title>
1314
1315       <para revision="277458" contrib="sponsor" sponsor="&ff;">The
1316         Release Engineering build tools have been updated to include
1317         support for producing virtual machine disk images for various
1318         cloud hosting providers.</para>
1319
1320       <para revision="278926">The Release Engineering build tools have
1321         been updated to use multi-threaded &man.xz.1;.  By default,
1322         the number of &man.xz.1; threads is set to the number of cores
1323         available.</para>
1324
1325       <para revision="281802" contrib="sponsor" sponsor="&ff;">The
1326         Release Engineering build tools have been updated to include
1327         support for building &os;/&arch.arm64; virtual machine and
1328         memory stick installation images.</para>
1329     </sect2>
1330   </sect1>
1331 </article>