Date: Tue, 10 Mar 2020 15:18:53 +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-12@freebsd.org Subject: svn commit: r358835 - stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <202003101518.02AFIrd3044288@repo.freebsd.org>
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Author: mav Date: Tue Mar 10 15:18:53 2020 New Revision: 358835 URL: https://svnweb.freebsd.org/changeset/base/358835 Log: MFC r358580: Increase number of write completion threads, matching ZoL. Our iSCSI benchmarks on a large 80-core system show that previous limit of 8 threads can be a bottleneck. At some points this change increases write IOPS by as much as 50%. I am still not sure that so many threads is really required, but we tested lower amounts and got no significant benefits, while latencies were a bit worse, so decided to not diverge. Modified: stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c ============================================================================== --- stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Mar 10 13:39:05 2020 (r358834) +++ stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Mar 10 15:18:53 2020 (r358835) @@ -155,7 +155,7 @@ const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ { ZTI_N(8), ZTI_NULL, ZTI_P(12, 8), ZTI_NULL }, /* READ */ - { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ + { ZTI_BATCH, ZTI_N(5), ZTI_P(12, 8), ZTI_N(5) }, /* WRITE */ { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */
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