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: 284813 -->
  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;.</para>
  98
  99     <para>Typical release note items document recent security
 100       advisories issued after &release.prev;, new drivers or hardware
 101       support, new commands or options, major bug fixes, or
 102       contributed software upgrades.  They may also list changes to
 103       major ports/packages or release engineering practices.  Clearly
 104       the release notes cannot list every single change made to &os;
 105       between releases; this document focuses primarily on security
 106       advisories, user-visible changes, and major architectural
 107       improvements.</para>
 108   </sect1>
 109
 110   <sect1 xml:id="upgrade">
 111     <title>Upgrading from Previous Releases of &os;</title>
 112
 113     <para arch="amd64,i386">Binary upgrades between RELEASE versions
 114       (and snapshots of the various security branches) are supported
 115       using the &man.freebsd-update.8; utility.  The binary upgrade
 116       procedure will update unmodified userland utilities, as well as
 117       unmodified <filename>GENERIC</filename> kernel distributed as
 118       a part of an official &os; release.  The &man.freebsd-update.8;
 119       utility requires that the host being upgraded have Internet
 120       connectivity.</para>
 121
 122     <para>Source-based upgrades (those based on recompiling the &os;
 123       base system from source code) from previous versions are
 124       supported, according to the instructions in
 125       <filename>/usr/src/UPDATING</filename>.</para>
 126
 127     <important>
 128       <para>Upgrading &os; should only be attempted after
 129         backing up <emphasis>all</emphasis> data and configuration
 130         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="276991">The &man.termcap.5; file is installed
 163         as-is from sources, instead of reordering, creating
 164         <filename>/etc/termcap.db</filename> by default, providing
 165         a performance improvements to applications that use the
 166         &man.termcap.5; database, such as &man.vi.1; and
 167         &man.ncurses.3;.</para>
 168     </sect2>
 169
 170     <sect2 xml:id="userland-programs">
 171       <title>Userland Application Changes</title>
 172
 173       <para revision="275040">A new utility, &man.dpv.1;, has been
 174         added to the base system, providing a &man.dialog.1;-style
 175         progress view from one or more input streams.  A corresponding
 176         library, &man.dpv.3;, has also been added.</para>
 177
 178       <para revision="275945">The &man.elfdump.1; utility has been
 179         updated to support capability mode provided by
 180         &man.capsicum.4;.</para>
 181
 182       <para revision="277434" contrib="sponsor" sponsor="&ff;">The
 183         &man.fstyp.8; utility has been added, which is used to
 184         determine the filesystem on a specified device.</para>
 185
 186       <para revision="278968" contrib="sponsor" sponsor="&ff;">The
 187         &man.mkimg.1; utility has been updated to support the
 188         <acronym>MBR</acronym> <acronym>EFI</acronym> partition
 189         type.</para>
 190
 191       <para revision="281044">A regression in the &man.libarchive.3;
 192         library that would prevent a directory from being included in
 193         the archive when <literal>--one-file-system</literal> is used
 194         has been fixed.</para>
 195
 196       <para revision="281161" contrib="sponsor"
 197         sponsor="&limelight;">A new flag, <literal>-R</literal>, has
 198         been added to the &man.netstat.8; utility, which is used to
 199         dump <acronym>RSS</acronym>/flow information.</para>
 200
 201       <para revision="281936" contrib="sponsor" sponsor="&ff;">The
 202         &man.ar.1; utility has been updated to set
 203         <literal>ARCHIVE_EXTRACT_SECURE_SYMLINKS</literal> and
 204         <literal>ARCHIVE_EXTRACT_SECURE_NODOTDOT</literal> to disallow
 205         directory traversal when extracting an archive, similar to
 206         &man.tar.1;.</para>
 207
 208       <para revision="282278">A race condition in &man.wc.1; that
 209         would cause final results to be sent to &man.stderr.4; when
 210         receiving the <literal>SIGINFO</literal> signal has been
 211         fixed.</para>
 212
 213       <para revision="282870" contrib="sponsor"
 214         sponsor="&scaleengine;">The &man.freebsd-update.8; utility has
 215         been updated to prevent fetching updated binary patches when
 216         a previous upgrade has not been thoroughly completed.</para>
 217
 218       <para revision="282974" contrib="sponsor" sponsor="&ff;">The
 219         &man.uefisign.8; utility has been added.</para>
 220
 221       <para revision="283875" contrib="sponsor"
 222         sponsor="&multiplay;">The &man.chflags.1;, &man.chgrp.1;,
 223         &man.chmod.1;, and &man.chown.8; utilities now affect symbolic
 224         links when the <literal>-R</literal> flag is specified, as
 225         documented in &man.symlink.7;.</para>
 226
 227       <para revision="283258">The &man.date.1; utility has been
 228         updated to print the modification time of the file passed as
 229         an argument to the <literal>-r</literal> flag, improving
 230         compatibility with the <acronym>GNU</acronym> &man.date.1;
 231         utility behavior.</para>
 232
 233       <para revision="284523">A new flag, <literal>-c</literal>, has
 234         been added to the &man.mkimg.1; utility, which allows
 235         specifying the capacity of the target disk image.</para>
 236
 237       <para revision="285092">The &man.pw.8; utility has been updated
 238         with a new flag, <literal>-R</literal>, that sets the root
 239         directory within which the utility will operate.</para>
 240     </sect2>
 241
 242     <sect2 xml:id="userland-contrib">
 243       <title>Contributed Software</title>
 244
 245       <para revision="282746" contrib="sponsor" sponsor="&ff;">The
 246         &man.resolvconf.8; utility has been updated to version
 247         3.7.0.</para>
 248
 249       <para revision="283270">The &man.nc.1; utility has been updated
 250         to the OpenBSD 5.7 version.</para>
 251
 252       <para revision="284398">Timezone data files have been updated to
 253         version 2015e.</para>
 254
 255       <para revision="284460">The &man.acpi.4; subsystem has been
 256         updated to version 20150515.</para>
 257
 258       <para revision="284778">The &man.file.1; utility has been
 259         updated to version 5.23.</para>
 260
 261       <para revision="285206">The &man.unbound.8; utility has been
 262         updated to version 1.5.3.</para>
 263
 264       <para revision="285305">The <application>sendmail</application>
 265         utility has been updated to version 8.15.2.</para>
 266
 267       <para revision="285330"><application>OpenSSL</application> has
 268         been updated to version 1.0.1p.</para>
 269
 270       <para revision="285612">The <application>ntp</application>
 271         suite has been updated to version 4.2.8p3.</para>
 272
 273       <para revision="285750" contrib="sponsor" sponsor="&dell;">The
 274         &man.ssh.1; utility has been updated to re-implement hostname
 275         canonicalization before locating the host in
 276         <filename>known_hosts</filename>.</para>
 277
 278       <para revision="286084">The &man.tar.1; utility has been updated
 279         to fix an issue that would prevent compressing sparse
 280         files.</para>
 281     </sect2>
 282
 283     <sect2 xml:id="userland-installer">
 284       <title>Installation and Configuration Tools</title>
 285
 286       <para revision="285769" contrib="sponsor"
 287         sponsor="&scaleengine;">Support for detecting and implementing
 288         a workaround for various laptops and motherboards that do not
 289         boot properly from <acronym>GPT</acronym>-partitioned disks
 290         has been added to &man.bsdinstall.8;.  Additionally, the
 291         <literal>active</literal> flag will be set on the partition
 292         when needed.</para>
 293
 294       <para revision="285721" contrib="sponsor"
 295         sponsor="&scaleengine;">Support for detecting and implementing
 296         aligning partitions on 1Mb boundaries has been added to
 297         &man.bsdinstall.8;.</para>
 298
 299       <para revision="285769" contrib="sponsor"
 300         sponsor="&scaleengine;">Support for selecting the partitioning
 301         scheme when installing on the <acronym>UFS</acronym>
 302         filesystem has been added to &man.bsdinstall.8;.</para>
 303     </sect2>
 304
 305     <sect2 xml:id="userland-rc">
 306       <title><filename class="directory">/etc/rc.d</filename>
 307         Scripts</title>
 308
 309       <para revision="284009">A new &man.rc.8; script,
 310         <filename>growfs</filename>, has been added, which will resize
 311         the root filesystem on boot if <filename>/firstboot</filename>
 312         exists.</para>
 313     </sect2>
 314
 315     <sect2 xml:id="userland-periodic">
 316       <title><filename class="directory">/etc/periodic</filename>
 317         Scripts</title>
 318
 319       <para revision="277520" contrib="sponsor" sponsor="&ff;">A new
 320         &man.periodic.8; script,
 321         <filename>510.status-world-kernel</filename>, has been added,
 322         which evaluates the running userland and kernel versions from
 323         the &man.uname.1; <literal>-U</literal> and
 324         <literal>-K</literal> arguments, and prints an error if the
 325         system userland and kernel are not in sync.</para>
 326     </sect2>
 327
 328     <sect2 xml:id="userland-libraries">
 329       <title>Runtime Libraries and API</title>
 330
 331       <para revision="275040">A new file configuration library,
 332         &man.figpar.3;, has been added to the base system.</para>
 333
 334       <para revision="276686" contrib="sponsor" sponsor="&ff;">The
 335         &man.procctl.2; system call has been updated to include
 336         a facility for non-&man.init.8; processes to be declared as
 337         the reaper of child processes and their decendants.</para>
 338
 339       <para revision="280392">The &man.setmode.3; function has been
 340         updated to consistently set <literal>errno</literal> on
 341         failure.</para>
 342     </sect2>
 343
 344     <sect2 xml:id="userland-abi">
 345       <title>ABI Compatibility</title>
 346
 347       <para revision="275807">The &linux; compatibility version has
 348         been updated to <literal>2.6.18</literal>.  The
 349         <literal>compat.linux.osrelease</literal> &man.sysctl.8; is
 350         evaluated when building the <filename
 351           role="package">emulators/linux-c6</filename> and related
 352         ports.</para>
 353     </sect2>
 354   </sect1>
 355
 356   <sect1 xml:id="kernel">
 357     <title>Kernel</title>
 358
 359     <para>This section covers changes to kernel configurations, system
 360       tuning, and system control parameters that are not otherwise
 361       categorized.</para>
 362
 363     <sect2 xml:id="kernel-bugfix">
 364       <title>Kernel Bug Fixes</title>
 365
 366       <para revision="276068">A kernel panic triggered when destroying
 367         a &man.vnet.9; &man.jail.8; configured with &man.gif.4; has
 368         been fixed.</para>
 369
 370       <para revision="284018">A kernel panic triggered when destroying
 371         a &man.vnet.9; &man.jail.8; configured with &man.gre.4; has
 372         been fixed.</para>
 373     </sect2>
 374
 375     <sect2 xml:id="kernel-config">
 376       <title>Kernel Configuration</title>
 377
 378       <para revision="282065" contrib="sponsor" sponsor="&ff;">The
 379         <literal>PAE_TABLES</literal> kernel configuration option has
 380         been added for &os;/&arch.i386;, which instructs &man.pmap.9;
 381         to use <acronym>PAE</acronym> format for page tables while
 382         maintaining a 32-bit physical address size elsewhere in the
 383         kernel.  The use of this option can enhance application-level
 384         security by enabling the creation of <quote>no execute</quote>
 385         mappings on modern &arch.i386; processors.  Unlike the
 386         <literal>PAE</literal> option, <literal>PAE_TABLES</literal>
 387         preserves kernel binary interface (<acronym>KBI</acronym>)
 388         compatibility with non-<literal>PAE</literal> kernels,
 389         allowing non-<literal>PAE</literal> kernel modules and drivers
 390         to work with a <literal>PAE_TABLES</literal>-enabled kernel.
 391         Additionally, system limits are tuned for 4GB maximum
 392         <acronym>RAM</acronym>, avoiding kernel virtual address space
 393         (<acronym>KVA</acronym>) exhaustion.</para>
 394
 395       <para revision="282826">The <literal>SIFTR</literal> kernel
 396         configuration has been added, allowing building &man.siftr.4;
 397         statically into the kernel.</para>
 398
 399       <para revision="283076" contrib="sponsor" sponsor="&intelcorp;"
 400         arch="amd64,i386">The &man.nvd.4; and &man.nvme.4; drivers are
 401         now included in the <filename>GENERIC</filename> kernel
 402         configuration by default.</para>
 403
 404       <para revision="283505" arch="arm">The &arch.arm; boot loader,
 405         <filename>ubldr</filename>, is now relocatable.  In addition,
 406         <filename>ubldr.bin</filename> is now created during build
 407         time, which is a stripped binary with an entry point of
 408         <literal>0</literal>, providing the ability to specify the
 409         load address by running <literal>go
 410           &dollar;{loadaddr}</literal> in
 411         <literal>u-boot</literal>.</para>
 412
 413       <para revision="284094" arch="arm">A new module for creating
 414         <filename>rpi.dtb</filename> has been added for the Raspberry
 415         Pi.</para>
 416
 417       <para revision="284094" arch="arm">The
 418         <filename>rpi.dtb</filename> module is now installed to
 419         <filename class="directory">/boot/dtb/</filename> by
 420         default for the Raspberry Pi system.</para>
 421
 422       <para revision="284096" arch="arm">A new module for creating
 423         the <filename>dtb</filename> module for AM335x systems has
 424         been added.</para>
 425
 426       <para revision="284522" contrib="sponsor"
 427         sponsor="&limelight;">A new kernel configuration option,
 428         <literal>EM_MULTIQUEUE</literal>, has been added which enables
 429         multi-queue support in the &man.em.4; driver.</para>
 430
 431       <note>
 432         <para>Multi-queue support in the &man.em.4; driver is not
 433           officially supported by &intel;.</para>
 434       </note>
 435     </sect2>
 436
 437     <sect2 xml:id="kernel-sysctl">
 438       <title>System Tuning and Controls</title>
 439
 440       <para revision="276986">Throttling via <acronym>ACPI</acronym>
 441         and <acronym>P4TCC</acronym> via &man.device.hints.5; have
 442         been turned off by default.</para>
 443
 444       <para revision="278982" contrib="sponsor" sponsor="&ff;">The
 445         &man.hwpmc.4; default and maximum callchain depths have been
 446         increased.  The default has been increased from 16 to 32, and
 447         the maximum increased from 32 to 128.</para>
 448
 449       <para revision="281255" contrib="sponsor"
 450         sponsor="&ix;, &ff;">The &man.devfs.5; device filesystem has
 451         been changed to update timestamps for read/write operations
 452         using seconds precision.  A new &man.sysctl.8;,
 453         <literal>vfs.devfs.dotimes</literal> has been added, which
 454         when set to a non-zero value, enables default precision
 455         timestamps for these operations.</para>
 456
 457       <para revision="280632">The <literal>kern.osrelease</literal>
 458         and <literal>kern.osreldate</literal> are now configurable
 459         &man.jail.8; parameters.</para>
 460
 461       <para revision="284665" contrib="sponsor" sponsor="&ff;">A new
 462         &man.sysctl.8;, <literal>kern.racct.enable</literal>, has been
 463         added, which when set to a non-zero value allows using
 464         &man.rctl.8; with the <literal>GENERIC</literal> kernel.
 465         A new kernel configuration option,
 466         <literal>RACCT_DISABLED</literal> has also been added.</para>
 467
 468       <para revision="284665" contrib="sponsor" sponsor="&ff;">The
 469         <literal>GENERIC</literal> kernel configuration now includes
 470         <literal>RACCT</literal> and <literal>RCTL</literal> by
 471         default.</para>
 472
 473       <note>
 474         <para>To enable <literal>RACCT</literal> and
 475           <literal>RCTL</literal> on a system using the
 476           <literal>GENERIC</literal> kernel configuration, add
 477           <literal>kern.racct.enable=1</literal> to
 478           &man.loader.conf.5;, and reboot the system.</para>
 479       </note>
 480     </sect2>
 481   </sect1>
 482
 483   <sect1 xml:id="drivers">
 484     <title>Devices and Drivers</title>
 485
 486     <para>This section covers changes and additions to devices and
 487       device drivers since &release.prev;.</para>
 488
 489     <sect2 xml:id="drivers-device">
 490       <title>Device Drivers</title>
 491
 492       <para revision="282199">The <literal>drm</literal> code has
 493         been updated to match &linux; version 3.8.13.</para>
 494
 495       <para revision="281708">The &man.psm.4; driver has been updated
 496         to include improved support for newer Synaptics&nbsp;&reg;
 497         touchpads and the ClickPad&nbsp;&reg; mouse on newer
 498         Lenovo&nbsp;&trade; laptops.</para>
 499     </sect2>
 500
 501     <sect2 xml:id="drivers-storage">
 502       <title>Storage Drivers</title>
 503
 504       <para revision="281957">The &man.hptnr.4; driver has been
 505         updated to version 1.1.1.</para>
 506
 507       <para revision="284879">The &man.hpt27xx.4; driver has been
 508         updated to version 1.2.7.</para>
 509     </sect2>
 510
 511     <sect2 xml:id="drivers-network">
 512       <title>Network Drivers</title>
 513
 514       <para revision="274486">The &man.pf.4; interface default hash
 515         has been changed from <literal>Jenkins</literal> to
 516         <literal>Murmur3</literal>, providing a 3-percent performance
 517         increase in packets-per-second.</para>
 518
 519       <para revision="279157">The &man.ral.4; driver has been updated
 520         to support the RT5390 and RT5392 chipsets.</para>
 521
 522       <para revision="284066" contrib="sponsor" sponsor="&yandex;">The
 523         &man.gre.4; driver has been significantly overhauled, and has
 524         been split into two separate modules, &man.gre.4; and
 525         &man.me.4;.</para>
 526
 527       <para revision="284365">The &man.vxlan.4; driver has been added,
 528         which creates a virtual Layer 2 (Ethernet) network overlaid in
 529         a Layer 3 (IP/UDP) network.  The &man.vxlan.4; driver is
 530         analogous to &man.vlan.4;, but is designed to be better suited
 531         for large, multiple-tenant datacenter environments.</para>
 532
 533       <para revision="284499">The &man.cdce.4; driver has been updated
 534         to include support for the RTL8153 chipset.</para>
 535
 536       <para revision="284555" contrib="sponsor"
 537         sponsor="&solarflare;">The &man.sfxge.4; driver has been
 538         updated to support Solarflare Flareon Ultra 7000-series
 539         chipsets.</para>
 540     </sect2>
 541   </sect1>
 542
 543   <sect1 xml:id="hardware">
 544     <title>Hardware Support</title>
 545
 546     <para>This section covers general hardware support for physical
 547       machines, hypervisors, and virtualization environments, as well
 548       as hardware changes and updates that do not otherwise fit in
 549       other sections of this document.</para>
 550
 551     <sect2 xml:id="hardware-support">
 552       <title>Hardware Support</title>
 553
 554       <para revision="278407">The &man.uart.4; driver has been updated
 555         to include support for the <acronym>AMT</acronym> serial
 556         interface found on the Lenovo&reg; ThinkPad&trade; T61.</para>
 557
 558       <para revision="279924">The &man.uart.4; driver has been updated
 559         to include support for the <acronym>AMT</acronym> serial
 560         interface found on the Lenovo&reg; ThinkPad&trade;
 561         T400.</para>
 562
 563       <para revision="281963">The &man.snd.hda.4; driver has been
 564         updated to support the Lenovo&reg; ThinkPad&trade; X1 20BS
 565         model.</para>
 566     </sect2>
 567
 568     <sect2 xml:id="hardware-virtualization">
 569       <title>Virtualization Support</title>
 570
 571       <para revision="275273">The &man.virtio.console.4; driver has
 572         been added, which provides an interface to VirtIO console
 573         devices through a &man.tty.4; device.</para>
 574
 575       <para revision="276403">The &man.bhyve.8; hypervisor has been
 576         updated to support &amd; processors with
 577         <acronym>SVM</acronym> and <acronym>AMD-V</acronym> hardware
 578         extensions.</para>
 579
 580       <para revision="280370">The &man.bhyve.8; hypervisor has been
 581         updated to support <literal>DSM TRIM</literal> commands for
 582         virtual <acronym>AHCI</acronym> disks.</para>
 583
 584       <para revision="283280" contrib="sponsor" sponsor="&msostc;">The
 585         Hyper-V&trade; drivers have been updated with several
 586         enhancements:</para>
 587
 588       <itemizedlist>
 589         <listitem>
 590           <para>The &man.hv.vmbus.4; driver now has multi-channel
 591             support.</para>
 592         </listitem>
 593
 594         <listitem>
 595           <para>The &man.hv.storvsc.4; driver now has scatter/gather
 596             support, in addition to performance improvements.</para>
 597         </listitem>
 598
 599         <listitem>
 600           <para>The &man.hv.kvp.4; driver has received several bug
 601             fixes.</para>
 602         </listitem>
 603       </itemizedlist>
 604
 605       <para revision="285236" contrib="sponsor" sponsor="&msostc;">The
 606         &man.hv.netvsc.4; driver has been updated to support checksum
 607         offloading and <acronym>TSO</acronym>.</para>
 608     </sect2>
 609
 610     <sect2 xml:id="hardware-arm">
 611       <title>ARM Support</title>
 612
 613       <para revision="278079" arch="arm">Support to turn off the
 614         BeagleBone Black system with the &man.shutdown.8;
 615         <literal>-p</literal> flag or by invoking &man.poweroff.8; has
 616         been added.</para>
 617
 618       <para revision="278599" arch="arm">Support for the Exynos 5420
 619         Octa system has been added.</para>
 620
 621       <para revision="278599" arch="arm">The <acronym>SMP</acronym>
 622         option has been enabled for all Exynos 5 systems supported by
 623         &os;.</para>
 624
 625       <para revision="278608">The <literal>bcm2835_cpufreq</literal>
 626         driver has been added, which supports <acronym>CPU</acronym>
 627         frequency and voltage control on the Raspberry Pi
 628         <acronym>SOC</acronym>.</para>
 629
 630       <para revision="283500" arch="arm">Support for the Toradex
 631         Apalis i.MX6 development board has been added.</para>
 632
 633       <para revision="283500" arch="arm">Audio transmission drivers
 634         have been added for Digital Audio Multiplexer
 635         (<acronym>AUDMUXM</acronym>), Smart Direct Memory Access
 636         Controller (<acronym>SDMA</acronym>), and Syncronous Serial
 637         Interface (<acronym>SSI</acronym>).</para>
 638     </sect2>
 639   </sect1>
 640
 641   <sect1 xml:id="storage">
 642     <title>Storage</title>
 643
 644     <para>This section covers changes and additions to file systems
 645       and other storage subsystems, both local and networked.</para>
 646
 647     <sect2 xml:id="storage-general">
 648       <title>General Storage</title>
 649
 650       <para revision="279002" contrib="sponsor" sponsor="&ix;">The
 651         &man.ctl.4; <acronym>LUN</acronym> mapping has been rewritten,
 652         replacing <acronym>iSCSI</acronym>-specific mapping mechanisms
 653         with a new mechanism that works for any port.</para>
 654
 655       <para revision="279055" contrib="sponsor" sponsor="&ix;">The
 656         &man.ctld.8; utility has been updated to allow controlling
 657         non-<acronym>iSCSI</acronym> &man.ctl.4; ports.</para>
 658
 659       <para revision="283223" contrib="sponsor" sponsor="&ff;">The
 660         &man.autofs.5; subsystem has been updated to include a new
 661         &man.auto.master.5; map, <literal>-media</literal>, which
 662         allows automatically mounting removable media, such as
 663         <acronym>CD</acronym> drives or <acronym>USB</acronym> flash
 664         drives.</para>
 665
 666       <para revision="283242" contrib="sponsor" sponsor="&ff;">The
 667         &man.autofs.5; subsystem has been updated to include a new
 668         &man.auto.master.5; map, <literal>-noauto</literal>, which
 669         handles &man.fstab.5; entries set to
 670         <literal>noauto</literal>.</para>
 671     </sect2>
 672
 673     <sect2 xml:id="storage-net">
 674       <title>Networked Storage</title>
 675
 676       <para revision="274939" contrib="sponsor" sponsor="&ix;">The
 677         &man.ctld.8; utility has been updated to include support for
 678         registering <acronym>iSCSI</acronym> targets and portals on
 679         <acronym>iSNS</acronym> servers.  This provides a mechanism
 680         which allows <acronym>iSCSI</acronym> initiators to find
 681         targets and portals without requiring active
 682         discovery.</para>
 683
 684       <para revision="275249" contrib="sponsor" sponsor="&ff;">Support
 685         for the <literal>timeo</literal>, <literal>actimeo</literal>,
 686         <literal>noac</literal>, and <literal>proto</literal> options
 687         have been added to &man.mount.nfs.8;.</para>
 688     </sect2>
 689
 690     <sect2 xml:id="storage-zfs">
 691       <title>ZFS</title>
 692
 693       <para revision="275490">A new tunable,
 694         <literal>vfs.zfs.spa_slop_shift</literal>, has been added,
 695         which controls how much space is reserved by default.</para>
 696
 697       <para revision="277583">The <literal>arc_meta_limit</literal>
 698         statistics are now visible through the
 699         <literal>kstat</literal> &man.sysctl.8;.  As a result of this
 700         change, the <literal>vfs.zfs.arc_meta_used</literal>
 701         &man.sysctl.8; has been removed, and replaced with the
 702         <literal>kstat.zfs.misc.arcstats.arc_meta_used</literal>
 703         &man.sysctl.8;.</para>
 704     </sect2>
 705
 706     <sect2 xml:id="storage-geom">
 707       <title>&man.geom.4;</title>
 708
 709       <para revision="275891" contrib="sponsor" sponsor="&ix;">The
 710         &man.ctl.4; subsystem has been updated, increasing the ports
 711         limit from <literal>128</literal> to <literal>256</literal>,
 712         and <acronym>LUN</acronym> limit from <literal>256</literal>
 713         to <literal>1024</literal>.</para>
 714
 715       <para revision="282861">Support for the
 716         <literal>apple-boot</literal>, <literal>apple-hfs</literal>,
 717         and <literal>apple-ufs</literal> <acronym>MBR</acronym>
 718         partitioning schemes have been added to &man.gpart.8;.</para>
 719     </sect2>
 720   </sect1>
 721
 722   <sect1 xml:id="boot">
 723     <title>Boot Loader Changes</title>
 724
 725     <para>This section covers the boot loader, boot menu, and other
 726       boot-related changes.</para>
 727
 728     <sect2 xml:id="boot-loader">
 729       <title>Boot Loader Changes</title>
 730
 731       <para revision="281323">Support for <literal>bzipfs</literal>
 732         has been added to the <acronym>EFI</acronym> loader.</para>
 733
 734       <para revision="281843">The boot loader has been updated to
 735         support entering the <acronym>GELI</acronym> passphrase before
 736         loading the kernel.  To enable this behavior, add
 737         <literal>geom_eli_passphrase_prompt="YES"</literal> to
 738         &man.loader.conf.5;.</para>
 739
 740       <para revision="283262" contrib="sponsor" sponsor="&ff;">The
 741         memory test run at boot time on &os;/&arch.amd64; platforms
 742         has been disabled by default.</para>
 743
 744       <para revision="283972">A new &man.ttys.5; class,
 745         <literal>3wire</literal>, has been added.  This is similar to
 746         the existing terminal classes, but does not have a defined
 747         baudrate.</para>
 748
 749       <para revision="284775" contrib="sponsor" sponsor="&ff;"
 750         arch="arm">The &man.ttys.5; file for &os;/&arch.arm; has been
 751         updated to enable <filename>ttyu1</filename>,
 752         <filename>ttyu2</filename>, and <filename>ttyu3</filename> by
 753         default, if the callin port is an active console port.</para>
 754     </sect2>
 755
 756     <sect2 xml:id="boot-menu">
 757       <title>Boot Menu Changes</title>
 758
 759       <para>&nbsp;</para>
 760     </sect2>
 761   </sect1>
 762
 763   <sect1 xml:id="network">
 764     <title>Networking</title>
 765
 766     <para>This section describes changes that affect networking in
 767       &os;.</para>
 768
 769     <sect2 xml:id="network-protocols">
 770       <title>Network Procols</title>
 771
 772       <para revision="273838" contrib="sponsor"
 773         sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
 774         blackhole detection (<acronym>RFC</acronym> 4821) has been
 775         added to the &man.tcp.4; stack, disabled by default.  New
 776         control tunables have been added:</para>
 777
 778       <informaltable frame="none" pgwide="0">
 779         <tgroup cols="2">
 780           <colspec colwidth="1*"/>
 781           <colspec colwidth="1*"/>
 782           <thead>
 783             <row>
 784               <entry>Tunable</entry>
 785               <entry>Description</entry>
 786             </row>
 787           </thead>
 788
 789           <tbody>
 790             <row>
 791               <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
 792               <entry>Enables or disables <acronym>PLPMTUD</acronym>
 793                 blackhole detection</entry>
 794             </row>
 795
 796             <row>
 797               <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
 798               <entry><acronym>MSS</acronym> to try for IPv4</entry>
 799             </row>
 800
 801             <row>
 802               <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
 803               <entry><acronym>MSS to try for IPv6</acronym></entry>
 804             </row>
 805           </tbody>
 806         </tgroup>
 807       </informaltable>
 808
 809       <para>New monitoring &man.sysctl.8;s haven been added:</para>
 810
 811       <informaltable frame="none" pgwide="0">
 812         <tgroup cols="2">
 813           <colspec colwidth="1*"/>
 814           <colspec colwidth="1*"/>
 815           <thead>
 816             <row>
 817               <entry>Tunable</entry>
 818               <entry>Description</entry>
 819             </row>
 820           </thead>
 821
 822           <tbody>
 823             <row>
 824               <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
 825               <entry>Number of times the code was activated to attempt
 826                 downshifting the <acronym>MSS</acronym></entry>
 827             </row>
 828
 829             <row>
 830               <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
 831               <entry>Number of times the blackhole
 832                 <acronym>MSS</acronym> was used in an attempt to
 833                 downshift</entry>
 834             </row>
 835
 836             <row>
 837               <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
 838               <entry>Number of times that the blackhole failed to
 839                 connect after downshifting the
 840                 <acronym>MSS</acronym></entry>
 841             </row>
 842           </tbody>
 843         </tgroup>
 844       </informaltable>
 845
 846     </sect2>
 847   </sect1>
 848
 849   <sect1 xml:id="ports">
 850     <title>Ports Collection and Package Infrastructure</title>
 851
 852     <para>This section covers changes to the &os;&nbsp;Ports
 853       Collection, package infrastructure, and package maintenance and
 854       installation tools.</para>
 855
 856     <sect2 xml:id="ports-infrastructure">
 857       <title>Infrastructure Changes</title>
 858
 859       <para>&nbsp;</para>
 860     </sect2>
 861
 862     <sect2 xml:id="ports-packages ">
 863       <title>Packaging Changes</title>
 864
 865       <para>&nbsp;</para>
 866     </sect2>
 867   </sect1>
 868
 869   <sect1 xml:id="doc">
 870     <title>Documentation</title>
 871
 872     <para>This section covers changes to the &os;&nbsp;Documentation
 873       Project sources and toolchain.</para>
 874
 875     <sect2 xml:id="doc-sources">
 876       <title>Documentation Source Changes</title>
 877
 878       <para>&nbsp;</para>
 879     </sect2>
 880
 881     <sect2 xml:id="doc-toolchain">
 882       <title>Documentation Toolchain Changes</title>
 883
 884       <para>&nbsp;</para>
 885     </sect2>
 886   </sect1>
 887
 888   <sect1 xml:id="releng">
 889     <title>Release Engineering and Integration</title>
 890
 891     <para>This section convers changes that are specific to the
 892       &os;&nbsp;Release Engineering processes.</para>
 893
 894     <sect2 xml:id="releng-changes">
 895       <title>Integration Changes</title>
 896
 897       <para revision="283161" contrib="sponsor" sponsor="&ff;">The
 898         Release Engineering build tools have been updated to support
 899         building &os;/&arch.arm; images without external utilities for
 900         supported boards where a corresponding
 901         <literal>u-boot</literal> port exists in the Ports
 902         Collection.</para>
 903
 904       <para revision="283548" contrib="sponsor" sponsor="&ff;">The
 905         &os;/&arch.i386; memory stick installation images are now
 906         created using the &man.mkimg.1; utility, matching the way
 907         the &os;/&arch.amd64; images are created.</para>
 908
 909       <para revision="285830" contrib="sponsor" sponsor="&ff;">The
 910         default &man.pkg.8; repository set in
 911         <filename>/etc/pkg/FreeBSD.conf</filename> now defaults to
 912         the <literal>quarterly</literal> package set.  To use the
 913         <literal>latest</literal> branch (as was the previous
 914         default), the comment at the top of
 915         <filename>/etc/pkg/FreeBSD.conf</filename> explains how to
 916         disable the default repository and specify an alternative
 917         repository.</para>
 918     </sect2>
 919   </sect1>
 920 </article>