Date: Tue, 3 Mar 2020 15:05:14 +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: r358580 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <202003031505.023F5EMj034316@repo.freebsd.org>
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Author: mav Date: Tue Mar 3 15:05:13 2020 New Revision: 358580 URL: https://svnweb.freebsd.org/changeset/base/358580 Log: 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. MFC after: 1 week Sponsored by: iXsystems, Inc. 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 Mar 3 15:02:07 2020 (r358579) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Mar 3 15:05:13 2020 (r358580) @@ -157,7 +157,7 @@ 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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