Date: Tue, 17 Jun 2014 08:09:41 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r267571 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201406170809.s5H89fXs031396@svn.freebsd.org>
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Author: mav Date: Tue Jun 17 08:09:40 2014 New Revision: 267571 URL: http://svnweb.freebsd.org/changeset/base/267571 Log: MFC r267029, r267038: 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. Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c ============================================================================== --- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Jun 17 08:02:50 2014 (r267570) +++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Jun 17 08:09:40 2014 (r267571) @@ -953,7 +953,11 @@ spa_taskq_dispatch_ent(spa_t *spa, zio_t if (tqs->stqs_count == 1) { tq = tqs->stqs_taskq[0]; } else { +#ifdef _KERNEL + tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count]; +#else tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; +#endif } taskq_dispatch_ent(tq, func, arg, flags, ent);
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