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

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   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">
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  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;">The &man.netstat.8; utility has been
 198         updated to include a new flag, <literal>-R</literal>, which is
 199         used to 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">The &man.mkimg.1; utility has been
 234         updated to include a new flag, <literal>-c</literal>, which
 235         allows specifying the capacity of the target disk
 236         image.</para>
 237
 238       <para revision="285092">The &man.pw.8; utility has been updated
 239         with a new flag, <literal>-R</literal>, that sets the root
 240         directory within which the utility will operate.</para>
 241     </sect2>
 242
 243     <sect2 xml:id="userland-contrib">
 244       <title>Contributed Software</title>
 245
 246       <para revision="282746" contrib="sponsor" sponsor="&ff;">The
 247         &man.resolvconf.8; utility has been updated to version
 248         3.7.0.</para>
 249
 250       <para revision="283270">The &man.nc.1; utility has been updated
 251         to the OpenBSD 5.7 version.</para>
 252
 253       <para revision="284398">Timezone data files have been updated to
 254         version 2015e.</para>
 255
 256       <para revision="284460">The &man.acpi.4; subsystem has been
 257         updated to version 20150515.</para>
 258
 259       <para revision="284778">The &man.file.1; utility has been
 260         updated to version 5.23.</para>
 261
 262       <para revision="285206">The &man.unbound.8; utility has been
 263         updated to version 1.5.3.</para>
 264
 265       <para revision="285305">The <application>sendmail</application>
 266         utility has been updated to version 8.15.2.</para>
 267
 268       <para revision="285330"><application>OpenSSL</application> has
 269         been updated to version 1.0.1p.</para>
 270
 271       <para revision="285612">The <application>ntp</application>
 272         suite has been updated to version 4.2.8p3.</para>
 273
 274       <para revision="285750" contrib="sponsor" sponsor="&dell;">The
 275         &man.ssh.1; utility has been updated to re-implement hostname
 276         canonicalization before locating the host in
 277         <filename>known_hosts</filename>.</para>
 278
 279       <para revision="286084">The &man.tar.1; utility has been updated
 280         to fix an issue that would prevent compressing sparse
 281         files.</para>
 282     </sect2>
 283
 284     <sect2 xml:id="userland-installer">
 285       <title>Installation and Configuration Tools</title>
 286
 287       <para revision="285769" contrib="sponsor"
 288         sponsor="&scaleengine;">Support for detecting and implementing
 289         a workaround for various laptops and motherboards that do not
 290         boot properly from <acronym>GPT</acronym>-partitioned disks
 291         has been added to &man.bsdinstall.8;.  Additionally, the
 292         <literal>active</literal> flag will be set on the partition
 293         when needed.</para>
 294
 295       <para revision="285721" contrib="sponsor"
 296         sponsor="&scaleengine;">Support for detecting and implementing
 297         aligning partitions on 1Mb boundaries has been added to
 298         &man.bsdinstall.8;.</para>
 299
 300       <para revision="285769" contrib="sponsor"
 301         sponsor="&scaleengine;">Support for selecting the partitioning
 302         scheme when installing on the <acronym>UFS</acronym>
 303         filesystem has been added to &man.bsdinstall.8;.</para>
 304     </sect2>
 305
 306     <sect2 xml:id="userland-rc">
 307       <title><filename class="directory">/etc/rc.d</filename>
 308         Scripts</title>
 309
 310       <para revision="284009">A new &man.rc.8; script,
 311         <filename>growfs</filename>, has been added, which will resize
 312         the root filesystem on boot if <filename>/firstboot</filename>
 313         exists.</para>
 314     </sect2>
 315
 316     <sect2 xml:id="userland-periodic">
 317       <title><filename class="directory">/etc/periodic</filename>
 318         Scripts</title>
 319
 320       <para revision="277520" contrib="sponsor" sponsor="&ff;">A new
 321         &man.periodic.8; script,
 322         <filename>510.status-world-kernel</filename>, has been added,
 323         which evaluates the running userland and kernel versions from
 324         the &man.uname.1; <literal>-U</literal> and
 325         <literal>-K</literal> arguments, and prints an error if the
 326         system userland and kernel are not in sync.</para>
 327     </sect2>
 328
 329     <sect2 xml:id="userland-libraries">
 330       <title>Runtime Libraries and API</title>
 331
 332       <para revision="275040">A new file configuration library,
 333         &man.figpar.3;, has been added to the base system.</para>
 334
 335       <para revision="276686" contrib="sponsor" sponsor="&ff;">The
 336         &man.procctl.2; system call has been updated to include
 337         a facility for non-&man.init.8; processes to be declared as
 338         the reaper of child processes and their decendants.</para>
 339
 340       <para revision="280392">The &man.setmode.3; function has been
 341         updated to consistently set <literal>errno</literal> on
 342         failure.</para>
 343     </sect2>
 344
 345     <sect2 xml:id="userland-abi">
 346       <title>ABI Compatibility</title>
 347
 348       <para revision="275807">The &linux; compatibility version has
 349         been updated to <literal>2.6.18</literal>.  The
 350         <literal>compat.linux.osrelease</literal> &man.sysctl.8; is
 351         evaluated when building the <filename
 352           role="package">emulators/linux-c6</filename> and related
 353         ports.</para>
 354     </sect2>
 355   </sect1>
 356
 357   <sect1 xml:id="kernel">
 358     <title>Kernel</title>
 359
 360     <para>This section covers changes to kernel configurations, system
 361       tuning, and system control parameters that are not otherwise
 362       categorized.</para>
 363
 364     <sect2 xml:id="kernel-bugfix">
 365       <title>Kernel Bug Fixes</title>
 366
 367       <para revision="276068">A kernel panic triggered when destroying
 368         a &man.vnet.9; &man.jail.8; configured with &man.gif.4; has
 369         been fixed.</para>
 370
 371       <para revision="284018">A kernel panic triggered when destroying
 372         a &man.vnet.9; &man.jail.8; configured with &man.gre.4; has
 373         been fixed.</para>
 374     </sect2>
 375
 376     <sect2 xml:id="kernel-config">
 377       <title>Kernel Configuration</title>
 378
 379       <para revision="282065" contrib="sponsor" sponsor="&ff;">The
 380         <literal>PAE_TABLES</literal> kernel configuration option has
 381         been added for &os;/&arch.i386;, which instructs &man.pmap.9;
 382         to use <acronym>PAE</acronym> format for page tables while
 383         maintaining a 32-bit physical address size elsewhere in the
 384         kernel.  The use of this option can enhance application-level
 385         security by enabling the creation of <quote>no execute</quote>
 386         mappings on modern &arch.i386; processors.  Unlike the
 387         <literal>PAE</literal> option, <literal>PAE_TABLES</literal>
 388         preserves kernel binary interface (<acronym>KBI</acronym>)
 389         compatibility with non-<literal>PAE</literal> kernels,
 390         allowing non-<literal>PAE</literal> kernel modules and drivers
 391         to work with a <literal>PAE_TABLES</literal>-enabled kernel.
 392         Additionally, system limits are tuned for 4GB maximum
 393         <acronym>RAM</acronym>, avoiding kernel virtual address space
 394         (<acronym>KVA</acronym>) exhaustion.</para>
 395
 396       <para revision="282826">The <literal>SIFTR</literal> kernel
 397         configuration has been added, allowing building &man.siftr.4;
 398         statically into the kernel.</para>
 399
 400       <para revision="283076" contrib="sponsor" sponsor="&intelcorp;"
 401         arch="amd64,i386">The &man.nvd.4; and &man.nvme.4; drivers are
 402         now included in the <filename>GENERIC</filename> kernel
 403         configuration by default.</para>
 404
 405       <para revision="283505" arch="arm">The &arch.arm; boot loader,
 406         <filename>ubldr</filename>, is now relocatable.  In addition,
 407         <filename>ubldr.bin</filename> is now created during build
 408         time, which is a stripped binary with an entry point of
 409         <literal>0</literal>, providing the ability to specify the
 410         load address by running <literal>go
 411           &dollar;{loadaddr}</literal> in
 412         <literal>u-boot</literal>.</para>
 413
 414       <para revision="284094" arch="arm">A new module for creating
 415         <filename>rpi.dtb</filename> has been added for the Raspberry
 416         Pi.</para>
 417
 418       <para revision="284094" arch="arm">The
 419         <filename>rpi.dtb</filename> module is now installed to
 420         <filename class="directory">/boot/dtb/</filename> by
 421         default for the Raspberry Pi system.</para>
 422
 423       <para revision="284096" arch="arm">A new module for creating
 424         the <filename>dtb</filename> module for AM335x systems has
 425         been added.</para>
 426
 427       <para revision="284522" contrib="sponsor"
 428         sponsor="&limelight;">A new kernel configuration option,
 429         <literal>EM_MULTIQUEUE</literal>, has been added which enables
 430         multi-queue support in the &man.em.4; driver.</para>
 431
 432       <note>
 433         <para>Multi-queue support in the &man.em.4; driver is not
 434           officially supported by &intel;.</para>
 435       </note>
 436     </sect2>
 437
 438     <sect2 xml:id="kernel-sysctl">
 439       <title>System Tuning and Controls</title>
 440
 441       <para revision="276986">Throttling via <acronym>ACPI</acronym>
 442         and <acronym>P4TCC</acronym> via &man.device.hints.5; have
 443         been turned off by default.</para>
 444
 445       <para revision="278982" contrib="sponsor" sponsor="&ff;">The
 446         &man.hwpmc.4; default and maximum callchain depths have been
 447         increased.  The default has been increased from 16 to 32, and
 448         the maximum increased from 32 to 128.</para>
 449
 450       <para revision="281255" contrib="sponsor"
 451         sponsor="&ix;, &ff;">The &man.devfs.5; device filesystem has
 452         been changed to update timestamps for read/write operations
 453         using seconds precision.  A new &man.sysctl.8;,
 454         <literal>vfs.devfs.dotimes</literal> has been added, which
 455         when set to a non-zero value, enables default precision
 456         timestamps for these operations.</para>
 457
 458       <para revision="280632">The <literal>kern.osrelease</literal>
 459         and <literal>kern.osreldate</literal> are now configurable
 460         &man.jail.8; parameters.</para>
 461
 462       <para revision="284665" contrib="sponsor" sponsor="&ff;">A new
 463         &man.sysctl.8;, <literal>kern.racct.enable</literal>, has been
 464         added, which when set to a non-zero value allows using
 465         &man.rctl.8; with the <literal>GENERIC</literal> kernel.
 466         A new kernel configuration option,
 467         <literal>RACCT_DISABLED</literal> has also been added.</para>
 468
 469       <para revision="284665" contrib="sponsor" sponsor="&ff;">The
 470         <literal>GENERIC</literal> kernel configuration now includes
 471         <literal>RACCT</literal> and <literal>RCTL</literal> by
 472         default.</para>
 473
 474       <note>
 475         <para>To enable <literal>RACCT</literal> and
 476           <literal>RCTL</literal> on a system using the
 477           <literal>GENERIC</literal> kernel configuration, add
 478           <literal>kern.racct.enable=1</literal> to
 479           &man.loader.conf.5;, and reboot the system.</para>
 480       </note>
 481     </sect2>
 482   </sect1>
 483
 484   <sect1 xml:id="drivers">
 485     <title>Devices and Drivers</title>
 486
 487     <para>This section covers changes and additions to devices and
 488       device drivers since &release.prev;.</para>
 489
 490     <sect2 xml:id="drivers-device">
 491       <title>Device Drivers</title>
 492
 493       <para revision="282199">The <literal>drm</literal> code has
 494         been updated to match &linux; version 3.8.13.</para>
 495
 496       <para revision="281708">The &man.psm.4; driver has been updated
 497         to include improved support for newer Synaptics&nbsp;&reg;
 498         touchpads and the ClickPad&nbsp;&reg; mouse on newer
 499         Lenovo&nbsp;&trade; laptops.</para>
 500     </sect2>
 501
 502     <sect2 xml:id="drivers-storage">
 503       <title>Storage Drivers</title>
 504
 505       <para revision="283990">The &man.mpr.4; driver has been
 506         updated to version 9.255.01.00-fbsd.</para>
 507
 508       <para revision="284879">The &man.hpt27xx.4; driver has been
 509         updated to version 1.2.7.</para>
 510
 511       <para revision="284935">The &man.hptnr.4; driver has been
 512         updated to version 1.1.4.</para>
 513     </sect2>
 514
 515     <sect2 xml:id="drivers-network">
 516       <title>Network Drivers</title>
 517
 518       <para revision="274486">The &man.pf.4; interface default hash
 519         has been changed from <literal>Jenkins</literal> to
 520         <literal>Murmur3</literal>, providing a 3-percent performance
 521         increase in packets-per-second.</para>
 522
 523       <para revision="279157">The &man.ral.4; driver has been updated
 524         to support the RT5390 and RT5392 chipsets.</para>
 525
 526       <para revision="284066" contrib="sponsor" sponsor="&yandex;">The
 527         &man.gre.4; driver has been significantly overhauled, and has
 528         been split into two separate modules, &man.gre.4; and
 529         &man.me.4;.</para>
 530
 531       <para revision="284365">The &man.vxlan.4; driver has been added,
 532         which creates a virtual Layer 2 (Ethernet) network overlaid in
 533         a Layer 3 (IP/UDP) network.  The &man.vxlan.4; driver is
 534         analogous to &man.vlan.4;, but is designed to be better suited
 535         for large, multiple-tenant datacenter environments.</para>
 536
 537       <para revision="284499">The &man.cdce.4; driver has been updated
 538         to include support for the RTL8153 chipset.</para>
 539
 540       <para revision="284555" contrib="sponsor"
 541         sponsor="&solarflare;">The &man.sfxge.4; driver has been
 542         updated to support Solarflare Flareon Ultra 7000-series
 543         chipsets.</para>
 544     </sect2>
 545   </sect1>
 546
 547   <sect1 xml:id="hardware">
 548     <title>Hardware Support</title>
 549
 550     <para>This section covers general hardware support for physical
 551       machines, hypervisors, and virtualization environments, as well
 552       as hardware changes and updates that do not otherwise fit in
 553       other sections of this document.</para>
 554
 555     <sect2 xml:id="hardware-support">
 556       <title>Hardware Support</title>
 557
 558       <para revision="278407">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; T61.</para>
 561
 562       <para revision="279924">The &man.uart.4; driver has been updated
 563         to include support for the <acronym>AMT</acronym> serial
 564         interface found on the Lenovo&reg; ThinkPad&trade;
 565         T400.</para>
 566
 567       <para revision="281963">The &man.snd.hda.4; driver has been
 568         updated to support the Lenovo&reg; ThinkPad&trade; X1 20BS
 569         model.</para>
 570     </sect2>
 571
 572     <sect2 xml:id="hardware-virtualization">
 573       <title>Virtualization Support</title>
 574
 575       <para revision="275273">The &man.virtio.console.4; driver has
 576         been added, which provides an interface to VirtIO console
 577         devices through a &man.tty.4; device.</para>
 578
 579       <para revision="276403">The &man.bhyve.8; hypervisor has been
 580         updated to support &amd; processors with
 581         <acronym>SVM</acronym> and <acronym>AMD-V</acronym> hardware
 582         extensions.</para>
 583
 584       <para revision="280370">The &man.bhyve.8; hypervisor has been
 585         updated to support <literal>DSM TRIM</literal> commands for
 586         virtual <acronym>AHCI</acronym> disks.</para>
 587
 588       <para revision="283280" contrib="sponsor" sponsor="&msostc;">The
 589         Hyper-V&trade; drivers have been updated with several
 590         enhancements:</para>
 591
 592       <itemizedlist>
 593         <listitem>
 594           <para>The &man.hv.vmbus.4; driver now has multi-channel
 595             support.</para>
 596         </listitem>
 597
 598         <listitem>
 599           <para>The &man.hv.storvsc.4; driver now has scatter/gather
 600             support, in addition to performance improvements.</para>
 601         </listitem>
 602
 603         <listitem>
 604           <para>The &man.hv.kvp.4; driver has received several bug
 605             fixes.</para>
 606         </listitem>
 607       </itemizedlist>
 608
 609       <para revision="285236" contrib="sponsor" sponsor="&msostc;">The
 610         &man.hv.netvsc.4; driver has been updated to support checksum
 611         offloading and <acronym>TSO</acronym>.</para>
 612     </sect2>
 613
 614     <sect2 xml:id="hardware-arm">
 615       <title>ARM Support</title>
 616
 617       <para revision="278079">Support to turn off the BeagleBone Black
 618         system with the &man.shutdown.8; <literal>-p</literal> flag or
 619         by invoking &man.poweroff.8; has been added.</para>
 620
 621       <para revision="278599">Support for the Exynos 5420 Octa system
 622         has been added.</para>
 623
 624       <para revision="278599">The <acronym>SMP</acronym> option has
 625         been enabled for all Exynos 5 systems supported by
 626         &os;.</para>
 627
 628       <para revision="278608">The <literal>bcm2835_cpufreq</literal>
 629         driver has been added, which supports <acronym>CPU</acronym>
 630         frequency and voltage control on the Raspberry Pi
 631         <acronym>SOC</acronym>.</para>
 632
 633       <para revision="283500">Support for the Toradex Apalis i.MX6
 634         development board has been added.</para>
 635
 636       <para revision="283500">Audio transmission drivers have been
 637         added for Digital Audio Multiplexer
 638         (<acronym>AUDMUXM</acronym>), Smart Direct Memory Access
 639         Controller (<acronym>SDMA</acronym>), and Syncronous Serial
 640         Interface (<acronym>SSI</acronym>).</para>
 641     </sect2>
 642   </sect1>
 643
 644   <sect1 xml:id="storage">
 645     <title>Storage</title>
 646
 647     <para>This section covers changes and additions to file systems
 648       and other storage subsystems, both local and networked.</para>
 649
 650     <sect2 xml:id="storage-general">
 651       <title>General Storage</title>
 652
 653       <para revision="279002" contrib="sponsor" sponsor="&ix;">The
 654         &man.ctl.4; <acronym>LUN</acronym> mapping has been rewritten,
 655         replacing <acronym>iSCSI</acronym>-specific mapping mechanisms
 656         with a new mechanism that works for any port.</para>
 657
 658       <para revision="279055" contrib="sponsor" sponsor="&ix;">The
 659         &man.ctld.8; utility has been updated to allow controlling
 660         non-<acronym>iSCSI</acronym> &man.ctl.4; ports.</para>
 661
 662       <para revision="283223" contrib="sponsor" sponsor="&ff;">The
 663         &man.autofs.5; subsystem has been updated to include a new
 664         &man.auto.master.5; map, <literal>-media</literal>, which
 665         allows automatically mounting removable media, such as
 666         <acronym>CD</acronym> drives or <acronym>USB</acronym> flash
 667         drives.</para>
 668
 669       <para revision="283242" contrib="sponsor" sponsor="&ff;">The
 670         &man.autofs.5; subsystem has been updated to include a new
 671         &man.auto.master.5; map, <literal>-noauto</literal>, which
 672         handles &man.fstab.5; entries set to
 673         <literal>noauto</literal>.</para>
 674     </sect2>
 675
 676     <sect2 xml:id="storage-net">
 677       <title>Networked Storage</title>
 678
 679       <para revision="274939" contrib="sponsor" sponsor="&ix;">The
 680         &man.ctld.8; utility has been updated to include support for
 681         registering <acronym>iSCSI</acronym> targets and portals on
 682         <acronym>iSNS</acronym> servers.  This provides a mechanism
 683         which allows <acronym>iSCSI</acronym> initiators to find
 684         targets and portals without requiring active
 685         discovery.</para>
 686
 687       <para revision="275249" contrib="sponsor" sponsor="&ff;">The
 688         &man.mount.nfs.8; utility has been updated to include support
 689         for the <literal>timeo</literal>, <literal>actimeo</literal>,
 690         <literal>noac</literal>, and <literal>proto</literal>
 691         options.</para>
 692     </sect2>
 693
 694     <sect2 xml:id="storage-zfs">
 695       <title>ZFS</title>
 696
 697       <para revision="275490">A new tunable,
 698         <literal>vfs.zfs.spa_slop_shift</literal>, has been added,
 699         which controls how much space is reserved by default.</para>
 700
 701       <para revision="277583">The <literal>arc_meta_limit</literal>
 702         statistics are now visible through the
 703         <literal>kstat</literal> &man.sysctl.8;.  As a result of this
 704         change, the <literal>vfs.zfs.arc_meta_used</literal>
 705         &man.sysctl.8; has been removed, and replaced with the
 706         <literal>kstat.zfs.misc.arcstats.arc_meta_used</literal>
 707         &man.sysctl.8;.</para>
 708     </sect2>
 709
 710     <sect2 xml:id="storage-geom">
 711       <title>GEOM</title>
 712
 713       <para revision="275891" contrib="sponsor" sponsor="&ix;">The
 714         &man.ctl.4; subsystem has been updated, increasing the ports
 715         limit from <literal>128</literal> to <literal>256</literal>,
 716         and <acronym>LUN</acronym> limit from <literal>256</literal>
 717         to <literal>1024</literal>.</para>
 718
 719       <para revision="282861">The &man.gpart.8; utility has been
 720         updated to include support for the
 721         <literal>apple-boot</literal>, <literal>apple-hfs</literal>,
 722         and <literal>apple-ufs</literal> <acronym>MBR</acronym>
 723         partitioning schemes.</para>
 724     </sect2>
 725   </sect1>
 726
 727   <sect1 xml:id="boot">
 728     <title>Boot Loader Changes</title>
 729
 730     <para>This section covers the boot loader, boot menu, and other
 731       boot-related changes.</para>
 732
 733     <sect2 xml:id="boot-loader">
 734       <title>Boot Loader Changes</title>
 735
 736       <para revision="281323">Support for <literal>bzipfs</literal>
 737         has been added to the <acronym>EFI</acronym> loader.</para>
 738
 739       <para revision="281843">The boot loader has been updated to
 740         support entering the <acronym>GELI</acronym> passphrase before
 741         loading the kernel.  To enable this behavior, add
 742         <literal>geom_eli_passphrase_prompt="YES"</literal> to
 743         &man.loader.conf.5;.</para>
 744
 745       <para revision="283262" contrib="sponsor" sponsor="&ff;">The
 746         memory test run at boot time on &os;/&arch.amd64; platforms
 747         has been disabled by default.</para>
 748
 749       <para revision="283972">A new &man.ttys.5; class,
 750         <literal>3wire</literal>, has been added.  This is similar to
 751         the existing terminal classes, but does not have a defined
 752         baudrate.</para>
 753
 754       <para revision="284775" contrib="sponsor" sponsor="&ff;"
 755         arch="arm">The &man.ttys.5; file for &os;/&arch.arm; has been
 756         updated to enable <filename>ttyu1</filename>,
 757         <filename>ttyu2</filename>, and <filename>ttyu3</filename> by
 758         default, if the callin port is an active console port.</para>
 759     </sect2>
 760   </sect1>
 761
 762   <sect1 xml:id="network">
 763     <title>Networking</title>
 764
 765     <para>This section describes changes that affect networking in
 766       &os;.</para>
 767
 768     <sect2 xml:id="network-protocols">
 769       <title>Network Procols</title>
 770
 771       <para revision="273838" contrib="sponsor"
 772         sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
 773         blackhole detection (<acronym>RFC</acronym> 4821) has been
 774         added to the &man.tcp.4; stack, disabled by default.  New
 775         control tunables have been added:</para>
 776
 777       <informaltable frame="none" pgwide="0">
 778         <tgroup cols="2">
 779           <colspec colwidth="1*"/>
 780           <colspec colwidth="1*"/>
 781           <thead>
 782             <row>
 783               <entry>Tunable</entry>
 784               <entry>Description</entry>
 785             </row>
 786           </thead>
 787
 788           <tbody>
 789             <row>
 790               <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
 791               <entry>Enables or disables <acronym>PLPMTUD</acronym>
 792                 blackhole detection</entry>
 793             </row>
 794
 795             <row>
 796               <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
 797               <entry><acronym>MSS</acronym> to try for IPv4</entry>
 798             </row>
 799
 800             <row>
 801               <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
 802               <entry><acronym>MSS to try for IPv6</acronym></entry>
 803             </row>
 804           </tbody>
 805         </tgroup>
 806       </informaltable>
 807
 808       <para>New monitoring &man.sysctl.8;s haven been added:</para>
 809
 810       <informaltable frame="none" pgwide="0">
 811         <tgroup cols="2">
 812           <colspec colwidth="1*"/>
 813           <colspec colwidth="1*"/>
 814           <thead>
 815             <row>
 816               <entry>Tunable</entry>
 817               <entry>Description</entry>
 818             </row>
 819           </thead>
 820
 821           <tbody>
 822             <row>
 823               <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
 824               <entry>Number of times the code was activated to attempt
 825                 downshifting the <acronym>MSS</acronym></entry>
 826             </row>
 827
 828             <row>
 829               <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
 830               <entry>Number of times the blackhole
 831                 <acronym>MSS</acronym> was used in an attempt to
 832                 downshift</entry>
 833             </row>
 834
 835             <row>
 836               <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
 837               <entry>Number of times that the blackhole failed to
 838                 connect after downshifting the
 839                 <acronym>MSS</acronym></entry>
 840             </row>
 841           </tbody>
 842         </tgroup>
 843       </informaltable>
 844     </sect2>
 845   </sect1>
 846
 847   <sect1 xml:id="ports">
 848     <title>Ports Collection and Package Infrastructure</title>
 849
 850     <para>This section covers changes to the &os;&nbsp;Ports
 851       Collection, package infrastructure, and package maintenance and
 852       installation tools.</para>
 853
 854     <sect2 xml:id="ports-versions">
 855       <title>Ports and Package Versions</title>
 856
 857       <para>The <filename role="package">ports-mgmt/pkg</filename>
 858         package has been updated to version 1.5.4 in the
 859         <literal>quarterly</literal> branch, and version 1.5.5 in the
 860         <literal>head</literal> branch.</para>
 861
 862       <para>The <filename
 863           role="package">x11-servers/xorg-server</filename> package
 864         for &os;&nbsp;&release.current; has been updated to version
 865         1.14.7_5.</para>
 866
 867       <para>The <filename role="package">x11/xorg</filename> package
 868         for &os;&nbsp;&release.current; has been updated to version
 869         7.7_2.</para>
 870
 871       <para>The <filename role="package">x11/gnome3</filename> package
 872         for &os;&nbsp;&release.current; has been updated to version
 873         3.14.2.</para>
 874
 875       <para>The <filename role="package">x11/kde4</filename> package
 876         for &os;&nbsp;&release.current; has been updated to version
 877         4.14.3.</para>
 878     </sect2>
 879   </sect1>
 880
 881   <sect1 xml:id="releng">
 882     <title>Release Engineering and Integration</title>
 883
 884     <para>This section convers changes that are specific to the
 885       &os;&nbsp;Release Engineering processes.</para>
 886
 887     <sect2 xml:id="releng-changes">
 888       <title>Integration Changes</title>
 889
 890       <para revision="283161" contrib="sponsor" sponsor="&ff;">The
 891         Release Engineering build tools have been updated to support
 892         building &os;/&arch.arm; images without external utilities for
 893         supported boards where a corresponding
 894         <literal>u-boot</literal> port exists in the Ports
 895         Collection.</para>
 896
 897       <para revision="283548" contrib="sponsor" sponsor="&ff;">The
 898         &os;/&arch.i386; memory stick installation images are now
 899         created using the &man.mkimg.1; utility, matching the way
 900         the &os;/&arch.amd64; images are created.</para>
 901
 902       <para revision="285830" contrib="sponsor" sponsor="&ff;">The
 903         default &man.pkg.8; repository set in
 904         <filename>/etc/pkg/FreeBSD.conf</filename> now defaults to
 905         the <literal>quarterly</literal> package set.  To use the
 906         <literal>latest</literal> branch (as was the previous
 907         default), the comment at the top of
 908         <filename>/etc/pkg/FreeBSD.conf</filename> explains how to
 909         disable the default repository and specify an alternative
 910         repository.</para>
 911     </sect2>
 912   </sect1>
 913 </article>