svn commit: r358580 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

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 */