mirror_zfs/module
Tim Chase d33931a83a Write issue taskq shouldn't be dynamic
This is as much an upstream compatibility as it's a bit of a performance
gain.

The illumos taskq implemention doesn't allow a TASKQ_THREADS_CPU_PCT type
to be dynamic and in fact enforces as much with an ASSERT.

As to performance, if this taskq is dynamic, it can cause excessive
contention on tq_lock as the threads are created and destroyed because it
can see bursts of many thousands of tasks in a short time, particularly
in heavy high-concurrency zvol write workloads.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #5236
2016-10-10 15:19:14 -07:00
..
avl Fix uninitialized variable in avl_add() 2016-07-25 14:21:34 -07:00
icp Porting over some ICP code that was missed in #4760 2016-10-10 11:34:57 -07:00
nvpair Fix file permissions 2016-10-08 14:57:56 -07:00
unicode Build user-space with different gcc optimization levels 2016-08-09 14:40:35 -07:00
zcommon Fletcher4: Incremental updates and ctx calculation 2016-10-07 12:44:12 -07:00
zfs Write issue taskq shouldn't be dynamic 2016-10-10 15:19:14 -07:00
zpios kmem_zalloc with KM_SLEEP will never return NULL 2016-09-01 11:39:45 -07:00
.gitignore module/.gitignore: Add *.dwo (#4580) 2016-05-02 09:07:04 -07:00
Makefile.in Illumos Crypto Port module added to enable native encryption in zfs 2016-07-20 10:43:30 -07:00