freebsd with flexible iflib nic queues
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Alexander Motin 3db35ffa2a Some more taskqueue optimizations.
- Optimize enqueue for two task priority values by adding new tq_hint
field, pointing to the last task inserted into the middle of the list.
In case of more then two priority values it should halve average search.
 - Move tq_active insert/remove out of the taskqueue_run_locked loop.
Instead of dirtying few shared cache lines per task introduce different
mechanism to drain active tasks, based on task sequence number counter,
that uses only cache lines already present in cache.  Since the new
mechanism does not need ordering, switch tq_active from TAILQ to LIST.
 - Move static and dynamic struct taskqueue fields into different cache
lines.  Move lock into its own cache line, so that heavy lock spinning
by multiple waiting threads would not affect the running thread.
 - While there, correct some TQ_SLEEP() wait messages.

This change fixes certain ZFS write workloads, causing huge congestion
on taskqueue lock.  Those workloads combine some large block writes to
saturate the pool and trigger allocation throttling, which uses higher
priority tasks to requeue the delayed I/Os, with many small blocks to
generate deep queue of small tasks for taskqueue to sort.

MFC after:	1 week
Sponsored by:	iXsystems, Inc.
2019-11-01 22:49:44 +00:00
bin Add iflag=fullblock to dd 2019-09-30 22:00:48 +00:00
cddl MFZoL: Avoid retrieving unused snapshot props 2019-10-26 17:11:02 +00:00
contrib [PPC64] Fix GDB sigtramp detection 2019-11-01 11:28:43 +00:00
crypto Merge OpenSSL 1.1.1d. 2019-09-10 21:08:17 +00:00
etc libexecinfo: Integrate NetBSD test into FreeBSD 2019-10-27 05:32:08 +00:00
gnu Get the readline header from the installed header instead of the from the source 2019-09-12 15:50:14 +00:00
include Make snprintf(3) and vscanf(3) definitions available under appropriate 2019-09-09 11:15:14 +00:00
kerberos5 Fix generation of krb5-config with LC_CTYPE=*.UTF-8 2019-07-01 11:47:45 +00:00
lib geli: raise WARNS to 6 2019-11-01 02:48:43 +00:00
libexec Remove trailing tab. 2019-10-27 18:27:25 +00:00
release picobsd: add deprecation notices 2019-10-21 00:52:21 +00:00
rescue Remove unused defines since r147075 2019-07-12 04:44:50 +00:00
sbin mdmfs(8): add -k skel option to populate fs from a skeleton 2019-11-01 03:10:53 +00:00
secure caroot: commit initial bundle 2019-10-04 02:34:20 +00:00
share add valectl to the system commands 2019-10-31 21:01:34 +00:00
stand We don't support configuring serial PCI cards in EFI. Make this clearer in the 2019-11-01 21:26:43 +00:00
sys Some more taskqueue optimizations. 2019-11-01 22:49:44 +00:00
targets - Retire pc-sysinstall(8) 2019-09-03 19:42:04 +00:00
tests netpfil tests: Add missing copyright & license statements 2019-10-29 09:47:12 +00:00
tools add valectl to the system commands 2019-10-31 21:01:34 +00:00
usr.bin truss: centralize pointer-constructing casts. 2019-10-31 22:29:13 +00:00
usr.sbin add valectl to the system commands 2019-10-31 21:01:34 +00:00
.arcconfig
.arclint
.cirrus.yml cirrus.yml: stop fetching OVMF.fd now that we're using the pkg 2019-07-30 16:40:33 +00:00
.clang-format Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitattributes Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitignore .gitignore: Add LINT kernel configurations generated into SRCDIR 2019-08-10 18:22:22 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS
MAINTAINERS [skip ci] Add me to MAINTAINERS for fusefs 2019-07-28 15:20:47 +00:00
Makefile Disconnect powerpc from the default tinderbox for now. 2019-10-14 21:22:42 +00:00
Makefile.inc1 Building head on stable/11 requires libzstd 2019-10-28 20:45:29 +00:00
Makefile.libcompat Build compat libraries before "everything". 2019-10-15 21:22:13 +00:00
Makefile.sys.inc
ObsoleteFiles.inc Belatedly remove stale debug symbols after r339270. 2019-10-23 00:05:29 +00:00
README
README.md
RELNOTES RELNOTES: Document r352668 (crontab -n and -q options) 2019-09-25 13:04:34 +00:00
UPDATING Remove obsoleted KPIs that were used to access interface address lists. 2019-10-21 18:17:03 +00:00

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