Date: Tue, 3 Jun 2014 21:06:03 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r267029 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201406032106.s53L63oR085624@svn.freebsd.org>
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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);
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