On 04.06.2014 08:04, Bryan Drewery wrote:
On 6/3/2014 4:06 PM, Alexander Motin wrote:
Author: mav
Date: Tue Jun 3 21:06:03 2014
New Revision: 267029
URL: http://svnweb.freebsd.org/changeset/base/267029
Log:
Replace gethrtime() with cpu_ticks(), as source of random for the taskqueue
selection. gethrtime() in our port updated with HZ rate, so unusable for
this specific purpose, completely draining benefit of multiple taskqueues.
MFC after: 2 weeks
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Jun 3
21:02:19 2014 (r267028)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Jun 3
21:06:03 2014 (r267029)
@@ -953,7 +953,7 @@ spa_taskq_dispatch_ent(spa_t *spa, zio_t
if (tqs->stqs_count == 1) {
tq = tqs->stqs_taskq[0];
} else {
- tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count];
+ tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count];
}
taskq_dispatch_ent(tq, func, arg, flags, ent);
FYI r267038.
Thanks. I am sorry.
--
Alexander Motin
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