svn commit: r267029 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

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);