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4 <!ENTITY % release PUBLIC "-//FreeBSD//ENTITIES Release Specification//EN" "release.ent">
6 <!ENTITY % sponsor PUBLIC "-//FreeBSD//ENTITIES Sponsor Specification//EN" "sponsor.ent">
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11 <!ENTITY errata SYSTEM "../../share/xml/errata.xml">
13 <article xmlns="http://docbook.org/ns/docbook"
14 xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
17 <title>&os; &release.current; Release Notes</title>
20 <orgname>The &os; Project</orgname>
23 <pubdate>$FreeBSD$</pubdate>
25 <!-- Last rev: 284814 -->
29 <holder role="mailto:doc@FreeBSD.org">The &os; Documentation
33 <legalnotice xml:id="trademarks" role="trademarks">
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
53 <sect1 xml:id="intro">
54 <title>Introduction</title>
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>
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
67 xlink:href="&release.url;">&release.url;</uri>.</para>
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
75 xlink:href="&release.url;">&release.url;</uri>.</para>
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
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>
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>
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>
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
112 <sect1 xml:id="upgrade">
113 <title>Upgrading from Previous Releases of &os;</title>
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>
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>
129 <para>Upgrading &os; should only be attempted after backing up
130 <emphasis>all</emphasis> data and configuration files.</para>
134 <sect1 xml:id="security-errata">
135 <title>Security and Errata</title>
137 <para>This section lists the various Security Advisories and
138 Errata Notices since &release.prev;.</para>
140 <sect2 xml:id="security">
141 <title>Security Advisories</title>
146 <sect2 xml:id="errata">
147 <title>Errata Notices</title>
153 <sect1 xml:id="userland">
154 <title>Userland</title>
156 <para>This section covers changes and additions to userland
157 applications, contributed software, and system utilities.</para>
159 <sect2 xml:id="userland-config">
160 <title>Userland Configuration Changes</title>
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>
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>
174 <para revision="272350">The <literal>MK_ARM_EABI</literal>
175 &man.src.conf.5; option has been removed.</para>
178 <sect2 xml:id="userland-programs">
179 <title>Userland Application Changes</title>
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>
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>
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
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>
205 <para revision="260926">Support for displaying VPD for PCI
206 devices via &man.pciconf.8; has been added.</para>
208 <para revision="261498">&man.ping.8; protects against malicious
209 network packets using the Capsicum framework to drop
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
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>
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
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
233 <para revision="271482">Support for adding empty partitions has
234 been added to the &man.mkimg.1; utility.</para>
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>
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>
247 <informaltable frame="none" pgwide="0">
249 <colspec colwidth="1*"/>
250 <colspec colwidth="1*"/>
253 <entry>Option</entry>
254 <entry>Output</entry>
260 <entry><literal>--version</literal></entry>
261 <entry>The current version of the &man.mkimg.1;
266 <entry><literal>--formats</literal></entry>
267 <entry>The disk image file formats supported by
268 &man.mkimg.1;</entry>
272 <entry><literal>--schemes</literal></entry>
273 <entry>The partition schemes supported by
274 &man.mkimg.1;</entry>
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
286 <para revision="274960">The &man.elfdump.1; utility has been
287 updated to support capability mode provided by
288 &man.capsicum.4;.</para>
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>
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>
298 <para revision="276893" contrib="sponsor" sponsor="&ff;">The
299 &man.mkimg.1; utility has been updated to support the
300 <acronym>MBR</acronym> <acronym>EFI</acronym> partition
303 <para revision="277166" arch="powerpc">The &man.ptrace.2; system
304 call has been updated include support for Altivec registers on
305 &os;/&arch.powerpc;.</para>
307 <para revision="278320">A new device control utility,
308 &man.devctl.8; has been added, which allows making
309 administrative changes to individual devices, such as
310 attaching and detaching drivers, and enabling and disabling
311 devices. The &man.devctl.8; utility uses the new
312 &man.devctl.3; library.</para>
314 <para revision="279122" contrib="sponsor"
315 sponsor="&juniper;">The &man.netstat.1; utility has been
316 updated to link against the &man.libxo.3; shared
319 <para revision="279139">A new flag, <literal>-c</literal>, has
320 been added to the &man.mkimg.1; utility, which allows
321 specifying the capacity of the target disk image.</para>
323 <para revision="279315" contrib="sponsor" sponsor="&ff;">The
324 &man.uefisign.8; utility has been added.</para>
326 <para revision="279571" contrib="sponsor"
327 sponsor="&scaleengine;">The &man.freebsd-update.8; utility has
328 been updated to prevent fetching updated binary patches when
329 a previous upgrade has not been thoroughly completed.</para>
331 <para revision="280870">A regression in the &man.libarchive.3;
332 library that would prevent a directory from being included in
333 the archive when <literal>--one-file-system</literal> is used
334 has been fixed.</para>
336 <para revision="281311" contrib="sponsor" sponsor="&ff;">The
337 &man.ar.1; utility has been updated to set
338 <literal>ARCHIVE_EXTRACT_SECURE_SYMLINKS</literal> and
339 <literal>ARCHIVE_EXTRACT_SECURE_NODOTDOT</literal> to disallow
340 directory traversal when extracting an archive, similar to
343 <para revision="281617">A race condition in &man.wc.1; that
344 would cause final results to be sent to &man.stderr.4; when
345 receiving the <literal>SIGINFO</literal> signal has been
348 <para revision="282208" contrib="sponsor"
349 sponsor="&multiplay;">The &man.chflags.1;, &man.chgrp.1;,
350 &man.chmod.1;, and &man.chown.8; utilities now affect symbolic
351 links when the <literal>-R</literal> flag is specified, as
352 documented in &man.symlink.7;.</para>
354 <para revision="282608">The &man.date.1; utility has been
355 updated to print the modification time of the file passed as
356 an argument to the <literal>-r</literal> flag, improving
357 compatibility with the <acronym>GNU</acronym> &man.date.1;
358 utility behavior.</para>
360 <para revision="283961">The &man.pw.8; utility has been updated
361 with a new flag, <literal>-R</literal>, that sets the root
362 directory within which the utility will operate.</para>
364 <para revision="284297" contrib="sponsor"
365 sponsor="&clusterhq;">The &man.lockstat.1; utility has been
366 updated with several improvements:</para>
370 <para>Spin locks are now reported as the amount of time
371 spinning, instead of loop iterations.</para>
375 <para>Reader locks are now recognized as adaptive that can
380 <para>Lock aquisition events for successful reader try-lock
381 events are now reported.</para>
385 <para>Spin and block events are now reported before lock
386 acquisition events.</para>
390 <para revision="284589" contrib="sponsor"
391 sponsor="&scaleengine;">The &man.fstyp.8; utility has been
392 updated to be able to detect &man.zfs.8; and &man.geli.8;
396 <sect2 xml:id="userland-contrib">
397 <title>Contributed Software</title>
399 <para revision="258884" contrib="sponsor"
400 sponsor="&darpa_afrl;">&man.lldb.1; has been updated to
401 upstream snapshot version r196259.</para>
403 <para revision="260445">&man.byacc.1; has been updated to
404 version 20140101.</para>
406 <para revision="261071">&man.jemalloc.3; has been updated to
407 version 3.5.0.</para>
409 <para revision="261283"><application>libc++</application> has
410 been updated to version 3.4.</para>
412 <para revision="261320"><application>OpenSSH</application> has
413 been updated to 6.5p1.</para>
415 <para revision="261344"><application>mdocml</application> has
416 been updated to version 1.12.3.</para>
418 <para revision="261991"><application>LLVM</application> and
419 <application>Clang</application> have been updated to
422 <para revision="275718">The <application>binutils</application>
423 suite of utilities has been updated to include upstream
424 patches that add new relocations for &arch.powerpc;
427 <para revision="276398" contrib="sponsor" sponsor="&ff;">The
428 <application>ELF Tool Chain</application> has been updated to
429 upstream revision r3136.</para>
431 <para revision="276551">The <application>texinfo</application>
432 utility and <literal>info</literal> pages were removed from
433 the base system. The <filename
434 role="package">print/texinfo</filename> port should be
435 installed on systems where <literal>info</literal> pages are
438 <para revision="276796" contrib="sponsor" sponsor="&ff;">The ELF
439 object manipulation tools
440 <application>addr2line</application>,
441 <application>elfcopy (strip)</application>,
442 <application>nm</application>,
443 <application>readelf</application>,
444 <application>size</application>, and
445 <application>strings</application> were switched to the
446 versions from the ELF Tool Chain project.</para>
448 <para revision="276881">The <literal>libedit</literal> library
449 has been updated to include <acronym>UTF-8</acronym> support,
450 adding <acronym>UTF-8</acronym> support to the &man.sh.1;
453 <para revision="278433">The &man.xz.1; utility has been updated
454 to support multi-threaded compression.</para>
456 <para revision="280932" contrib="sponsor" sponsor="&ff;">The
457 <application>elftoolchain</application> utilities have been
458 updated to version 3179.</para>
460 <para revision="281316">The &man.xz.1; utility has been updated
461 to version 5.2.1.</para>
463 <para revision="281373">The &man.nvi.1; utility has been updated
464 to version 2.1.3.</para>
466 <para revision="281806">The &man.wpa.supplicant.8; and
467 &man.hostapd.8; utilities have been updated to version
470 <para revision="282089">The &man.unbound.8; utility has been
471 updated to version 1.5.3.</para>
473 <para revision="282434" contrib="sponsor" sponsor="&ff;">The
474 &man.resolvconf.8; utility has been updated to version
477 <para revision="282613">The &man.nc.1; utility has been updated
478 to the OpenBSD 5.7 version.</para>
480 <para revision="283092">The &man.acpi.4; subsystem has been
481 updated to version 20150515.</para>
483 <para revision="284237">The &man.file.1; utility has been
484 updated to version 5.23.</para>
486 <para revision="284254"><application>bmake</application> has
487 been updated to version 20150606.</para>
489 <para revision="284397">Timezone data files have been updated to
490 version 2015e.</para>
492 <para revision="285229"><application>sendmail</application> has
493 been updated to 8.15.2. Starting with &os; 11.0 and
494 sendmail 8.15, sendmail uses uncompressed IPv6 addresses by
495 default, i.e., they will not contain <quote>::</quote>. For
496 example, instead of <quote>::1</quote>, it will be
497 <quote>0:0:0:0:0:0:0:1</quote>. This permits a zero subnet to
498 have a more specific match, such as different map entries for
499 IPv6:0:0 versus IPv6:0. This change requires that
500 configuration data (including maps, files, classes, custom
501 ruleset, etc.) must use the same format, so make certain such
502 configuration data is upgrading. As a very simple check
503 search for patterns like 'IPv6:[0-9a-fA-F:]*::' and 'IPv6::'.
504 To return to the old behavior, set the m4 option
505 <literal>confUSE_COMPRESSED_IPV6_ADDRESSES</literal> or the cf
506 option <literal>UseCompressedIPv6Addresses</literal>.</para>
508 <para revision="285329"><application>OpenSSL</application> has
509 been updated to version 1.0.1p.</para>
512 <sect2 xml:id="userland-installer">
513 <title>Installation and Configuration Tools</title>
515 <para revision="271539">The &man.bsdinstall.8; partition editor
516 and &man.sade.8; utility have been updated to include native
517 <acronym>ZFS</acronym> support.</para>
519 <para revision="272274">The &os; installation utility,
520 &man.bsdinstall.8;, has been updated to set the
521 <literal>canmount</literal> &man.zfs.8; property to
522 <literal>off</literal> for the <filename
523 class="directory">/var</filename> dataset, preventing the
524 contents of directories within <filename
525 class="directory">/var</filename> from conflicting when
526 using multiple boot environments, such as that provided by
527 <filename role="package">sysutils/beadm</filename>.</para>
529 <para revision="274394">The &man.bsdconfig.8; utility has been
530 updated to skip the initial &man.tzsetup.8;
531 <acronym>UTC</acronym> versus wall-clock time prompt when run
532 in a virtual machine, determined when the
533 <literal>kern.vm_guest</literal> &man.sysctl.8; is set to
534 <literal>1</literal>.</para>
536 <para revision="275874">The &man.bsdinstall.8; utility has been
537 updated to use the new &man.dpv.3; library to display progress
538 when extracting the &os; distributions.</para>
541 <sect2 xml:id="userland-rc">
542 <title><filename class="directory">/etc/rc.d</filename>
545 <para revision="270676">The &man.rc.8; subsystem has been
546 updated to allow configuring services in <filename
547 class="directory">${LOCALBASE}/etc/rc.conf.d/</filename>.
548 If <literal>LOCALBASE</literal> is unset, it defaults to
549 <filename class="directory">/usr/local</filename>.</para>
551 <para revision="273955">A new &man.rc.8; script,
552 <filename>growfs</filename>, has been added, which will resize
553 the root filesystem on boot if <filename>/firstboot</filename>
556 <para revision="275299">The <filename>mrouted</filename>
557 &man.rc.8; script has been removed from the base system. An
558 equivalent script is available from the <filename
559 role="package">net/mrouted</filename> port.</para>
561 <para revision="279463" contrib="sponsor"
562 sponsor="&sandvine;">A new &man.rc.8; script,
563 <filename>iovctl</filename>, has been added, which allows
564 automatically starting the &man.iovctl.8; utility at
568 <sect2 xml:id="userland-periodic">
569 <title><filename class="directory">/etc/periodic</filename>
572 <para revision="271321">The daily &man.periodic.8; script
573 <filename>110.clean-tmps</filename> has been updated to avoid
574 crossing filesystem mount boundaries when cleaning files in
575 <filename class="directory">/tmp</filename>.</para>
577 <para revision="277216" contrib="sponsor" sponsor="&ff;">A new
578 &man.periodic.8; script,
579 <filename>510.status-world-kernel</filename>, has been added,
580 which evaluates the running userland and kernel versions from
581 the &man.uname.1; <literal>-U</literal> and
582 <literal>-K</literal> arguments, and prints an error if the
583 system userland and kernel are not in sync.</para>
586 <sect2 xml:id="userland-libraries">
587 <title>Runtime Libraries and API</title>
589 <para revision="265995">The Blowfish &man.crypt.3; default
590 format has been changed to
591 <literal>$2b$</literal>.</para>
593 <para revision="268461">The &man.readline.3; library is now
594 statically linked in software within the base system, and the
595 shared library is no longer installed, allowing the Ports
596 Collection to use a modern version of the library.</para>
598 <para revision="272273">The &man.strptime.3; library has been
599 updated to add support for <acronym>POSIX</acronym>-2001
600 features <literal>%U</literal> and
601 <literal>%W</literal>.</para>
603 <para revision="272842,272848" contrib="sponsor"
604 sponsor="&ff;">The &man.dl.iterate.phdr.3; library has been
605 changed to always return the path name of the
606 <acronym>ELF</acronym> object in the
607 <literal>dlpi_name</literal> structure member.</para>
609 <para revision="273562" contrib="sponsor"
610 sponsor="&juniper;">The &man.libxo.3; library has been
611 imported to the base system.</para>
613 <para revision="273806" contrib="sponsor" sponsor="&chelsio;">A
614 userland library for Chelsio Terminator 5 based iWARP cards
615 has been added, allowing userland <acronym>RDMA</acronym>
616 applications to work over compatible
617 <acronym>NIC</acronym>s.</para>
619 <para revision="274987">The &man.gpio.3; library has been added,
620 providing a wrapper around the &man.gpio.4; kernel
623 <para revision="275800" contrib="sponsor" sponsor="&ff;">The
624 &man.procctl.2; system call has been updated to include
625 a facility for non-&man.init.8; processes to be declared as
626 the reaper of child processes and their decendants.</para>
628 <para revision="277610">The <literal>futimens()</literal> and
629 <literal>utimensat()</literal> system calls have been
630 added. See &man.utimensat.2; for more information.</para>
632 <para revision="278934">The &man.elf.3; compile-time dependency
633 has been removed from <filename>dtri.o</filename>, which
634 allows adding <application>DTrace</application> probes to
635 userland applications and libraries without also linking
636 against &man.elf.3;.</para>
638 <para revision="279186">The &man.setmode.3; function has been
639 updated to consistently set <literal>errno</literal> on
642 <para revision="279663">The &man.qsort.3; functions have been
643 updated to be able to handle 32-bit aligned data on 64-bit
644 platforms, also providing a significant improvement in 32-bit
647 <para revision="281130">Several standard include headers have
648 been updated to use of <application>gcc</application>
649 attributes, such as <literal>__result_use_check()</literal>,
650 <literal>__alloc_size()</literal>, and
651 <literal>__nonnull()</literal>.</para>
653 <para revision="281845">Support for file verification in
654 <acronym>MAC</acronym> has been added.</para>
656 <para revision="282973" contrib="sponsor" sponsor="&ff;">The
657 <literal>libgomp</literal> library is now only built when
658 building <acronym>GCC</acronym> from the base system. An
659 up-to-date version is available in the Ports Collection as
661 role="package">devel/libiomp5-devel</filename>.</para>
663 <para revision="282988">The <filename>stdlib.h</filename> and
664 <filename>malloc.h</filename> headers have been updated to
665 make use of the <application>gcc</application>
666 <literal>alloc_align()</literal> attribute.</para>
668 <para revision="284483" contrib="sponsor"
669 sponsor="&scaleengine;">The Blowfish &man.crypt.3; library
670 has been updated to support $2y$ hashes.</para>
673 <sect2 xml:id="userland-abi">
674 <title>ABI Compatibility</title>
676 <para revision="271982">The &linux; compatibility version has
677 been updated to <literal>2.6.18</literal>. The
678 <literal>compat.linux.osrelease</literal> &man.sysctl.8; is
679 evaluated when building the <filename
680 role="package">emulators/linux-c6</filename> and related
685 <sect1 xml:id="kernel">
686 <title>Kernel</title>
688 <para>This section covers changes to kernel configurations, system
689 tuning, and system control parameters that are not otherwise
692 <sect2 xml:id="kernel-bugfix">
693 <title>Kernel Bug Fixes</title>
695 <para revision="265876">A kernel bug that inhibited proper
696 functionality of the <literal>dev.cpu.0.freq</literal>
697 &man.sysctl.8; on &intel; processors with Turbo
698 Boost ™ enabled has been fixed.</para>
700 <para revision="271697" arch="powerpc">Support for
701 &man.dtrace.1; stack tracing has been fixed for
702 &os;/&arch.powerpc;, using the <literal>trapexit()</literal>
703 and <literal>asttrapexit()</literal> functions instead of
704 checking within addressed kernel space.</para>
706 <para revision="271917">A kernel panic triggered when destroying
707 a &man.vnet.9; &man.jail.8; configured with &man.gif.4; has
710 <para revision="271918">A kernel panic triggered when destroying
711 a &man.vnet.9; &man.jail.8; configured with &man.gre.4; has
714 <para revision="272089">A bug in &man.ipfw.4; that could
715 potentially lead to a kernel panic when using &man.dummynet.4;
716 at layer 2 has been fixed.</para>
718 <para revision="280930" contrib="sponsor" sponsor="&mitail;">The
719 kernel <acronym>RPC</acronym> has been updated to include
720 several enhancements:</para>
724 <para>The 45 MiB limit on requests queued for
725 &man.nfsd.8; threads has been removed.</para>
729 <para>Avoids unnecessary throttling by not deferring
730 accounting for completed requests.</para>
734 <para>Fixes an integer overflow and signedness bugs.</para>
738 <para revision="281261" arch="powerpc">Support for
739 &man.dtrace.1; has been added for the
740 Book-E ™.</para>
743 <sect2 xml:id="kernel-config">
744 <title>Kernel Configuration</title>
746 <para revision="266531">The <literal>IMAGACT_BINMISC</literal>
747 kernel configuration option has been enabled by default,
748 which enables application execution through emulators, such
749 as <application>Qemu</application>.</para>
751 <para revision="268045">The <literal>VT</literal> kernel
752 configuration file has been removed, and the &man.vt.4;
753 driver is included in the <literal>GENERIC</literal> kernel.
754 To enable &man.vt.4;, enter <literal>set kern.vty=vt</literal>
755 at the &man.loader.8; prompt during boot, or add
756 <literal>kern.vty=vt</literal> to &man.loader.conf.5; and
757 reboot the system.</para>
759 <para revision="277904">The &man.config.8; utility has been
760 updated to allow using a non-standard <filename
761 class="directory">src/</filename> tree, specified as an
762 argument to the <literal>-s</literal> flag.</para>
764 <para revision="277990" arch="powerpc64">The
765 &os;/&arch.powerpc64; kernel now builds as
766 a position-independent executable, allowing the kernel to be
767 loaded into and run from any physical or virtual
771 <para>This change requires an update to &man.loader.8;.
772 The userland and kernel must be updated before rebooting the
776 <para revision="279189" contrib="sponsor" sponsor="&ff;"
777 arch="powerpc">Kernel support for Vector-Scalar eXtension
778 (<acronym>VSX</acronym>) found on POWER7 and POWER8 hardware
779 has been added.</para>
781 <para revision="279252" contrib="sponsor" sponsor="&ff;"
782 arch="powerpc">The &man.pmap.9; implementation for 64-bit
783 &powerpc; processors has been overhaulded to improve
786 <para revision="282921" contrib="sponsor" sponsor="&intelcorp;"
787 arch="amd64,i386">The &man.nvd.4; and &man.nvme.4; drivers are
788 now included in the <filename>GENERIC</filename> kernel
789 configuration by default.</para>
791 <para revision="283959" contrib="sponsor"
792 sponsor="&limelight;">A new kernel configuration option,
793 <literal>EM_MULTIQUEUE</literal>, has been added which enables
794 multi-queue support in the &man.em.4; driver.</para>
797 <para>Multi-queue support in the &man.em.4; driver is not
798 officially supported by &intel;.</para>
802 <sect2 xml:id="kernel-sysctl">
803 <title>System Tuning and Controls</title>
805 <para revision="275140" contrib="sponsor" sponsor="&ff;">The
806 &man.hwpmc.4; default and maximum callchain depths have been
807 increased. The default has been increased from 16 to 32, and
808 the maximum increased from 32 to 128.</para>
810 <para revision="279361">The <literal>kern.osrelease</literal>
811 and <literal>kern.osreldate</literal> are now configurable
812 &man.jail.8; parameters.</para>
814 <para revision="280308,280949" contrib="sponsor"
815 sponsor="&ix;, &ff;">The &man.devfs.5; device filesystem has
816 been changed to update timestamps for read/write operations
817 using seconds precision. A new &man.sysctl.8;,
818 <literal>vfs.devfs.dotimes</literal> has been added, which
819 when set to a non-zero value, enables default precision
820 timestamps for these operations.</para>
822 <para revision="282213" contrib="sponsor" sponsor="&ff;">A new
823 &man.sysctl.8;, <literal>kern.racct.enable</literal>, has been
824 added, which when set to a non-zero value allows using
825 &man.rctl.8; with the <literal>GENERIC</literal> kernel.
826 A new kernel configuration option,
827 <literal>RACCT_DISABLED</literal> has also been added.</para>
829 <para revision="282901" contrib="sponsor" sponsor="&ff;">The
830 <literal>GENERIC</literal> kernel configuration now includes
831 <literal>RACCT</literal> and <literal>RCTL</literal> by
835 <para>To enable <literal>RACCT</literal> and
836 <literal>RCTL</literal> on a system using the
837 <literal>GENERIC</literal> kernel configuration, add
838 <literal>kern.racct.enable=1</literal> to
839 &man.loader.conf.5;, and reboot the system.</para>
842 <para revision="283136" contrib="sponsor"
843 sponsor="&limelight;">A new &man.sysctl.8;,
844 <literal>net.inet.tcp.hostcache.purgenow</literal>, has
845 been added, which when set to <literal>1</literal> during
846 runtime will flush all
847 <literal>net.inet.tcp.hostcache</literal> entries.</para>
851 <sect1 xml:id="drivers">
852 <title>Devices and Drivers</title>
854 <para>This section covers changes and additions to devices and
855 device drivers since &release.prev;.</para>
857 <sect2 xml:id="drivers-device">
858 <title>Device Drivers</title>
860 <para revision="260903">Support for GPS ports has been added to
863 <para revision="265132">The &man.full.4; device has been added,
864 and the <literal>lindev(4)</literal> device has been removed.
865 Prior to this change, <literal>lindev(4)</literal> provided
866 only the <filename>/dev/full</filename> character device,
867 returning <literal>ENOSPC</literal> on write attempts. As
868 this device is not specific to &linux;, a native &os; version
869 has been added.</para>
871 <para revision="271705">Hardware context support has been
872 added to the <literal>drm/i915</literal> driver, adding
873 support for <application>Mesa</application> 9.2 and
876 <para revision="273178">The &man.vt.4; driver has been updated,
877 replacing the bitmapped <literal>kern.vt.spclkeys</literal>
878 &man.sysctl.8; with individual
879 <literal>kern.vt.kbd_*</literal> variants.</para>
881 <para revision="273598">The &man.hpet.4; driver has been updated
883 <filename>/dev/hpet<replaceable>N</replaceable></filename>
884 device, providing access to <acronym>HPET</acronym> from
887 <para revision="280183">The <literal>drm</literal> code has
888 been updated to match &linux; version 3.8.13.</para>
890 <para revision="281440">The &man.psm.4; driver has been updated
891 to include improved support for newer Synaptics ®
892 touchpads and the ClickPad ® mouse on newer
893 Lenovo ™ laptops.</para>
895 <para revision="282783" arch="powerpc">Support for the Freescale
896 <acronym>PCI</acronym> Root Complex device has been
900 <sect2 xml:id="drivers-storage">
901 <title>Storage Drivers</title>
903 <para revision="265236" contrib="sponsor"
904 sponsor="&lsi;, &spectralogic;" sponsorurl="">The &man.mpr.4;
905 device has been added, providing support for LSI Fusion-MPT
906 3 12Gb SCSI/SATA controllers.</para>
908 <para revision="265555" contrib="sponsor"
909 sponsor="&lsi;">The &man.mrsas.4; driver has been added,
910 providing support for LSI MegaRAID SAS controllers. The
911 &man.mfi.4; driver will attach to the controller, by default.
912 To enable &man.mrsas.4; add
913 <literal>hw.mfi.mrsas_enable=1</literal> to
914 <filename>/boot/loader.conf</filename>, which turns off
915 &man.mfi.4; device probing.</para>
918 <para>At this time, the &man.mfiutil.8; utility and the &os;
919 version of <application>MegaCLI</application> and
920 <application>StorCli</application> do not work with
921 &man.mrsas.4;.</para>
924 <para revision="275461" contrib="sponsor" sponsor="&ix;">The
925 &man.ctl.4; subsystem has been updated, increasing the ports
926 limit from <literal>128</literal> to <literal>256</literal>,
927 and <acronym>LUN</acronym> limit from <literal>256</literal>
928 to <literal>1024</literal>.</para>
930 <para revision="276526">The <literal>asr(4)</literal> driver has
931 been removed, and is no longer supported.</para>
933 <para revision="281387">The &man.hptnr.4; driver has been
934 updated to version 1.1.1.</para>
937 <sect2 xml:id="drivers-network">
938 <title>Network Drivers</title>
940 <para revision="258830">Support for Broadcom chipsets BCM57764,
941 BCM57767, BCM57782, BCM57786 and BCM57787 has been added to
944 <para revision="260448">Support for the &intel; Centrino™
945 Wireless-N 135 chipset has been added.</para>
947 <para revision="260552">Firmware for &intel; Centrino™
948 Wireless-N 105 devices has been added to the base
951 <para revision="261975">The deprecated nve(4) driver has been
952 removed. Users of NVIDIA nForce MCP network adapters are
953 advised to use the &man.nfe.4; driver instead, which has been
954 the default driver for this hardware since
955 &os; 7.0.</para>
957 <para revision="264601" contrib="sponsor"
958 sponsor="&darpa_afrl;">The <literal>if_nf10bmac(4)</literal>
959 device has been added, providing support for NetFPGA-10G
960 Embedded CPU Ethernet Core.</para>
963 <para>The <literal>if_nf10bmac(4)</literal> driver operates on
964 the FPGA, and is not suited for the PCI host
968 <para revision="265348" contrib="sponsor"
969 sponsor="&netgate;">The &man.ath.hal.4; driver has been
970 updated to support the Atheros AR1111 chipset.</para>
972 <para revision="266770">Support for the &intel; Centrino™
973 Wireless-N 105 chipset has been added.</para>
975 <para revision="266757" contrib="sponsor"
976 sponsor="&chelsio;">Support for the &man.cxgbe.4; Terminator
977 5 (T5) 10G/40G cards has been added to &man.netmap.4;.</para>
979 <para revision="272730">The &man.alc.4; driver has been updated
980 to support AR816x and AR817x ethernet controllers.</para>
982 <para revision="272906">The &man.pfil.9; interface default hash
983 has been changed from <literal>Jenkins</literal> to
984 <literal>Murmur3</literal>, providing a 3-percent performance
985 increase in packets-per-second.</para>
987 <para revision="273331">The &man.vxlan.4; driver has been added,
988 which creates a virtual Layer 2 (Ethernet) network overlaid in
989 a Layer 3 (IP/UDP) network. The &man.vxlan.4; driver is
990 analogous to &man.vlan.4;, but is designed to be better suited
991 for large, multiple-tenant datacenter environments.</para>
993 <para revision="274246" contrib="sponsor" sponsor="&yandex;">The
994 &man.gre.4; driver has been significantly overhauled, and has
995 been split into two separate modules, &man.gre.4; and
998 <para revision="278551">The &man.ral.4; driver has been updated
999 to support the RT5390 and RT5392 chipsets.</para>
1001 <para revision="283766" contrib="sponsor"
1002 sponsor="&limelight;">The &man.em.4; driver has been updated
1003 with improved transmission queue hang detection.</para>
1005 <para revision="284125">The &man.cdce.4; driver has been updated
1006 to include support for the RTL8153 chipset.</para>
1010 <sect1 xml:id="hardware">
1011 <title>Hardware Support</title>
1013 <para>This section covers general hardware support for physical
1014 machines, hypervisors, and virtualization environments, as well
1015 as hardware changes and updates that do not otherwise fit in
1016 other sections of this document.</para>
1018 <sect2 xml:id="hardware-support">
1019 <title>Hardware Support</title>
1021 <para revision="268303">The &man.asmc.4; driver has been
1022 updated to support the &apple; MacMini 3,1.</para>
1024 <para revision="268351">Support for &os;/ia64 has been dropped
1025 as of &os; 11.</para>
1027 <para revision="274386">An issue that could cause a system to
1028 hang when entering <acronym>ACPI</acronym>
1029 <literal>S3</literal> state (suspend to
1030 <acronym>RAM</acronym>) has been corrected in the &man.acpi.4;
1031 and &man.pci.4; drivers.</para>
1033 <para revision="274733" arch="powerpc">The power management unit
1034 subsystem has been updated to support power button events on
1035 certain &arch.powerpc; hardware, such as aluminum
1036 PowerBook ®.</para>
1038 <para revision="275171,275190" arch="powerpc">The &man.hwpmc.4;
1039 driver has been updated to correct performance counter
1040 sampling on G4 (MPC74xxx) and G5 class processors.</para>
1042 <para revision="275732" contrib="sponsor"
1043 sponsor="&ff;,&netgate;">The
1044 <application>OpenCrypto</application> framework has been
1045 updated to include <literal>AES-ICM</literal> and
1046 <literal>AES-GCM</literal> modes, both of which have also been
1047 added to the &man.aesni.4; driver.</para>
1049 <para revision="281713" arch="powerpc">The &man.hwpmc.4;
1050 driver has been updated to support the Freescale e500
1053 <para revision="283766">The &man.ig4.4; driver has been added,
1054 providing support for the fourth generation &intel;
1055 <acronym>I2C</acronym> SMBus.</para>
1057 <para>The &man.uart.4; driver has been updated to support
1058 <acronym>AMT</acronym> devices on newer systems.</para>
1061 <sect2 xml:id="hardware-virtualization">
1062 <title>Virtualization Support</title>
1064 <para revision="260410">Support for the <quote>Virtual Interrupt
1065 Delivery</quote> feature of &intel; VT-x is enabled if
1066 supported by the CPU. This feature can be disabled by running
1067 <literal>sysctl hw.vmm.vmx.use_apic_vid=0</literal>.
1068 Additionally, to persist this setting across reboots, add
1069 <literal>hw.vmm.vmx.use_apic_vid=0</literal> to
1070 <filename>/etc/sysctl.conf</filename>.</para>
1072 <para revision="260532">Support for <quote>Posted Interrupt
1073 Processing</quote> is enabled if supported by the CPU. This
1074 feature can be disabled by running <literal>sysctl
1075 hw.vmm.vmx.use_apic_pir=0</literal>. Additionally, to
1076 persist this setting across reboots, add
1077 <literal>hw.vmm.vmx.use_apic_pir=0</literal> to
1078 <filename>/etc/sysctl.conf</filename>.</para>
1080 <para revision="260582">Unmapped IO support has been added to
1081 &man.virtio_blk.4;.</para>
1083 <para revision="260583">Unmapped IO support has been added to
1084 &man.virtio_scsi.4;.</para>
1086 <para revision="260847">The &man.virtio_random.4; driver has
1087 been added to harvest entropy from the host system.</para>
1089 <para revision="261504">&os;/&arch.i386; guests can be run under
1092 <para revision="267536" contrib="sponsor"
1093 sponsor="&citrix.rd;">Support for running a &os;/&arch.amd64;
1094 <application>Xen</application> guest instance as
1095 <acronym>PVH</acronym> guest has been added.
1096 <acronym>PVH</acronym> mode, short for <quote>Para-Virtualized
1097 Hardware</quote>, uses para-virtualized drivers for boot and
1098 I/O, and uses hardware virtualization extensions for all other
1099 tasks, without the need for emulation.</para>
1101 <para revision="273375">The &man.bhyve.8; hypervisor has been
1102 updated to support &amd; processors with
1103 <acronym>SVM</acronym> and <acronym>AMD-V</acronym> hardware
1106 <para revision="273515">The &man.virtio.console.4; driver has
1107 been added, which provides an interface to VirtIO console
1108 devices through a &man.tty.4; device.</para>
1110 <para revision="279957">The &man.bhyve.8; hypervisor has been
1111 updated to support <literal>DSM TRIM</literal> commands for
1112 virtual <acronym>AHCI</acronym> disks.</para>
1114 <para revision="281439" arch="arm">Support for the
1115 <application>QEMU</application> <literal>virt</literal> system
1116 has been added.</para>
1118 <para revision="282212" contrib="sponsor" sponsor="&msostc;">The
1119 Hyper-V™ drivers have been updated with several
1120 enhancements:</para>
1124 <para>The &man.hv.vmbus.4; driver now has multi-channel
1129 <para>The &man.hv.storvsc.4; driver now has scatter/gather
1130 support, in addition to performance improvements.</para>
1134 <para>The &man.hv.kvp.4; driver has received several bug
1139 <para revision="282274">Support for &man.xen.4; para-virtualized
1140 <literal>domU</literal> kernels has been removed.</para>
1142 <para revision="284746" contrib="sponsor" sponsor="&msostc;">The
1143 &man.hv.netvsc.4; driver has been updated to support checksum
1144 offloading and <acronym>TSO</acronym>.</para>
1147 <sect2 xml:id="hardware-arm">
1148 <title>ARM Support</title>
1150 <para revision="260921">The &man.nand.4; device is enabled for
1151 ARM devices by default.</para>
1153 <para revision="266943" arch="arm">Support for the Exynos 5420
1154 Octa system has been added.</para>
1156 <para revision="267390" arch="arm">The <acronym>SMP</acronym>
1157 option has been enabled for all Exynos 5 systems supported by
1160 <para revision="268838" arch="arm">Support for the Toradex
1161 Apalis i.MX6 development board has been added.</para>
1163 <para revision="273264" arch="armv6">An issue that could cause
1164 instability when detecting <acronym>SD</acronym> cards on the
1165 Raspberry Pi <acronym>SOC</acronym> has been fixed.</para>
1167 <para revision="275963">The <literal>bcm2835_cpufreq</literal>
1168 driver has been added, which supports <acronym>CPU</acronym>
1169 frequency and voltage control on the Raspberry Pi
1170 <acronym>SOC</acronym>.</para>
1172 <para revision="277042" arch="arm">Support to turn off the
1173 BeagleBone Black system with the &man.shutdown.8;
1174 <literal>-p</literal> flag or by invoking &man.poweroff.8; has
1177 <para revision="277644" arch="arm">Audio transmission drivers
1178 have been added for Digital Audio Multiplexer
1179 (<acronym>AUDMUXM</acronym>), Smart Direct Memory Access
1180 Controller (<acronym>SDMA</acronym>), and Syncronous Serial
1181 Interface (<acronym>SSI</acronym>).</para>
1183 <para revision="280259" contrib="sponsor" sponsor="&ff;">Initial
1184 support for the ARM AArch64 architecture has been
1187 <para revision="282779" arch="arm">Kernel support for Thumb-2
1188 userland has been added.</para>
1190 <para revision="282827">Support for the hardware power button
1191 on the BeagleBone Black system has been added.</para>
1193 <para revision="284273" contrib="sponsor"
1194 sponsor="&ff;">Initial
1195 <acronym>ACPI</acronym> support has been added for
1196 &os;/&arch.arm64;.</para>
1200 <sect1 xml:id="storage">
1201 <title>Storage</title>
1203 <para>This section covers changes and additions to file systems
1204 and other storage subsystems, both local and networked.</para>
1206 <sect2 xml:id="storage-general">
1207 <title>General Storage</title>
1209 <para revision="278037" contrib="sponsor" sponsor="&ix;">The
1210 &man.ctl.4; <acronym>LUN</acronym> mapping has been rewritten,
1211 replacing <acronym>iSCSI</acronym>-specific mapping mechanisms
1212 with a new mechanism that works for any port.</para>
1214 <para revision="278354" contrib="sponsor" sponsor="&ix;">The
1215 &man.ctld.8; utility has been updated to allow controlling
1216 non-<acronym>iSCSI</acronym> &man.ctl.4; ports.</para>
1218 <para revision="275681" contrib="sponsor" sponsor="&ff;">The
1219 &man.autofs.5; subsystem has been updated to include a new
1220 &man.auto.master.5; map, <literal>-media</literal>, which
1221 allows automatically mounting removable media, such as
1222 <acronym>CD</acronym> drives or <acronym>USB</acronym> flash
1225 <para revision="279955" contrib="sponsor" sponsor="&ff;">The
1226 &man.autofs.5; subsystem has been updated to include a new
1227 &man.auto.master.5; map, <literal>-noauto</literal>, which
1228 handles &man.fstab.5; entries set to
1229 <literal>noauto</literal>.</para>
1232 <sect2 xml:id="storage-net">
1233 <title>Networked Storage</title>
1235 <para revision="270096" contrib="sponsor" sponsor="&ff;">The new
1236 filesystem automount facility, &man.autofs.5;, has been added.
1237 The new &man.autofs.5; facility is similar to that found in
1238 other &unix;-like operating systems, such as OS X™
1239 and Solaris™. The &man.autofs.5; facility uses
1240 a &sun;-compatible &man.auto.master.5; configuration file, and
1241 is administered with the &man.automount.8; userland utility,
1242 and the &man.automountd.8; and &man.autounmountd.8;
1246 <sect2 xml:id="storage-zfs">
1249 <para revision="275748">The <literal>arc_meta_limit</literal>
1250 statistics are now visible through the
1251 <literal>kstat</literal> &man.sysctl.8;. As a result of this
1252 change, the <literal>vfs.zfs.arc_meta_used</literal>
1253 &man.sysctl.8; has been removed, and replaced with the
1254 <literal>kstat.zfs.misc.arcstats.arc_meta_used</literal>
1255 &man.sysctl.8;.</para>
1258 <sect2 xml:id="storage-geom">
1259 <title>&man.geom.4;</title>
1261 <para revision="267359">Support for the
1262 <literal>disklabel64</literal> partitioning scheme has been
1263 added to &man.gpart.8;.</para>
1265 <para revision="282465">Support for the
1266 <literal>apple-boot</literal>, <literal>apple-hfs</literal>,
1267 and <literal>apple-ufs</literal> <acronym>MBR</acronym>
1268 partitioning schemes have been added to &man.gpart.8;.</para>
1272 <sect1 xml:id="boot">
1273 <title>Boot Loader Changes</title>
1275 <para>This section covers the boot loader, boot menu, and other
1276 boot-related changes.</para>
1278 <sect2 xml:id="boot-loader">
1279 <title>Boot Loader Changes</title>
1281 <para revision="258431" contrib="sponsor" sponsor="&ff;">The
1282 memory test run at boot time on &os;/&arch.amd64; platforms
1283 has been disabled by default.</para>
1285 <para revision="262955">A new &man.ttys.5; class,
1286 <literal>3wire</literal>, has been added. This is similar to
1287 the existing terminal classes, but does not have a defined
1290 <para revision="274085">The &man.vt.4; driver has been made the
1291 default system console driver. The &man.syscons.4; driver is
1292 still available, and can be enabled by adding
1293 <literal>kern.vty=sc</literal> in &man.loader.conf.5;.
1294 Alternatively, &man.syscons.4; can be enabled at boot time by
1295 entering <literal>set kern.vty=sc</literal> at the
1296 &man.loader.8; prompt.</para>
1298 <para revision="281616">The boot loader has been updated to
1299 support entering the <acronym>GELI</acronym> passphrase before
1300 loading the kernel. To enable this behavior, add
1301 <literal>geom_eli_passphrase_prompt="YES"</literal> to
1302 &man.loader.conf.5;.</para>
1304 <para revision="284683" contrib="sponsor" sponsor="&ff;"
1305 arch="arm">The &man.ttys.5; file for &os;/&arch.arm; has been
1306 updated to enable <filename>ttyu1</filename>,
1307 <filename>ttyu2</filename>, and <filename>ttyu3</filename> by
1308 default, if the callin port is an active console port.</para>
1311 <sect2 xml:id="boot-menu">
1312 <title>Boot Menu Changes</title>
1318 <sect1 xml:id="network">
1319 <title>Networking</title>
1321 <para>This section describes changes that affect networking in
1324 <sect2 xml:id="network-protocols">
1325 <title>Network Procols</title>
1327 <para revision="263140">Support for the IPX network transport
1328 protocol has been removed, and will not be supported in
1329 &os; 11 and later releases.</para>
1331 <para revision="272720" contrib="sponsor"
1332 sponsor="&limelight;">Support for <acronym>PLPMTUD</acronym>
1333 blackhole detection (<acronym>RFC</acronym> 4821) has been
1334 added to the &man.tcp.4; stack, disabled by default. New
1335 control tunables have been added:</para>
1337 <informaltable frame="none" pgwide="0">
1339 <colspec colwidth="1*"/>
1340 <colspec colwidth="1*"/>
1343 <entry>Tunable</entry>
1344 <entry>Description</entry>
1350 <entry><literal>net.inet.tcp.pmtud_blackhole_detection</literal></entry>
1351 <entry>Enables or disables <acronym>PLPMTUD</acronym>
1352 blackhole detection</entry>
1356 <entry><literal>net.inet.tcp.pmtud_blackhole_mss</literal></entry>
1357 <entry><acronym>MSS</acronym> to try for IPv4</entry>
1361 <entry><literal>net.inet.tcp.v6pmtud_blackhole_mss</literal></entry>
1362 <entry><acronym>MSS to try for IPv6</acronym></entry>
1368 <para>New monitoring &man.sysctl.8;s haven been added:</para>
1370 <informaltable frame="none" pgwide="0">
1372 <colspec colwidth="1*"/>
1373 <colspec colwidth="1*"/>
1376 <entry>Tunable</entry>
1377 <entry>Description</entry>
1383 <entry><literal>net.inet.tcp.pmtud_blackhole_activated</literal></entry>
1384 <entry>Number of times the code was activated to attempt
1385 downshifting the <acronym>MSS</acronym></entry>
1389 <entry><literal>net.inet.tcp.pmtud_blackhole_min_activated</literal></entry>
1390 <entry>Number of times the blackhole
1391 <acronym>MSS</acronym> was used in an attempt to
1396 <entry><literal>net.inet.tcp.pmtud_blackhole_failed</literal></entry>
1397 <entry>Number of times that the blackhole failed to
1398 connect after downshifting the
1399 <acronym>MSS</acronym></entry>
1405 <para revision="280971" contrib="sponsor"
1406 sponsor="&netflix;, &nginx;">Support for <acronym>IP</acronym>
1407 identification for atomic datagrams (<acronym>RFC</acronym>
1408 6864) has been added. Support for this feature can be toggled
1409 with the <literal>net.inet.ip.rfc6864</literal>
1410 &man.sysctl.8;, which is enabled by default.</para>
1414 <sect1 xml:id="ports">
1415 <title>Ports Collection and Package Infrastructure</title>
1417 <para>This section covers changes to the &os; Ports
1418 Collection, package infrastructure, and package maintenance and
1419 installation tools.</para>
1421 <sect2 xml:id="ports-infrastructure">
1422 <title>Infrastructure Changes</title>
1427 <sect2 xml:id="ports-packages ">
1428 <title>Packaging Changes</title>
1434 <sect1 xml:id="doc">
1435 <title>Documentation</title>
1437 <para>This section covers changes to the &os; Documentation
1438 Project sources and toolchain.</para>
1440 <sect2 xml:id="doc-sources">
1441 <title>Documentation Source Changes</title>
1446 <sect2 xml:id="doc-toolchain">
1447 <title>Documentation Toolchain Changes</title>
1453 <sect1 xml:id="releng">
1454 <title>Release Engineering and Integration</title>
1456 <para>This section convers changes that are specific to the
1457 &os; Release Engineering processes.</para>
1459 <sect2 xml:id="releng-changes">
1460 <title>Integration Changes</title>
1462 <para revision="277458" contrib="sponsor" sponsor="&ff;">The
1463 Release Engineering build tools have been updated to include
1464 support for producing virtual machine disk images for various
1465 cloud hosting providers.</para>
1467 <para revision="278926">The Release Engineering build tools have
1468 been updated to use multi-threaded &man.xz.1;. By default,
1469 the number of &man.xz.1; threads is set to the number of cores
1472 <para revision="281802" contrib="sponsor" sponsor="&ff;">The
1473 Release Engineering build tools have been updated to include
1474 support for building &os;/&arch.arm64; virtual machine and
1475 memory stick installation images.</para>
1477 <para revision="282693" contrib="sponsor" sponsor="&ff;">The
1478 Release Engineering build tools have been updated to support
1479 building &os;/&arch.arm; images without external utilities for
1480 supported boards where a corresponding
1481 <literal>u-boot</literal> port exists in the Ports
1484 <para revision="283307" contrib="sponsor" sponsor="&ff;">The
1485 &os;/&arch.i386; memory stick installation images are now
1486 created using the &man.mkimg.1; utility, matching the way
1487 the &os;/&arch.amd64; images are created.</para>