zfs/module
Tim Chase 4c83fa9b87 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
2017-02-03 10:24:26 -08:00
..
avl Fix uninitialized variable in avl_add() 2017-02-03 10:23:42 -08:00
nvpair OpenZFS 7263 - deeply nested nvlist can overflow stack 2016-09-09 13:21:09 -07:00
unicode Support parallel build trees (VPATH builds) 2015-07-17 13:42:51 -07:00
zcommon Fix uioskip crash when skip to end 2015-09-29 15:27:14 -07:00
zfs Write issue taskq shouldn't be dynamic 2017-02-03 10:24:26 -08:00
zpios Linux 4.2 compat: misc_deregister() 2015-09-01 09:33:18 -07:00
.gitignore gitignore: anchor entries at their respective directory 2013-04-02 10:50:17 -07:00
Makefile.in Prevent rm modules.* when make install 2015-12-23 17:29:34 -08:00