Author: avg
Date: Tue Mar 7 15:27:23 2017
New Revision: 314857
URL: https://svnweb.freebsd.org/changeset/base/314857
Log:
MFC r314058: zfs: lower priority of zio_write_issue threads by four
Obtained from: Panzura
Sponsored by: Panzura
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 Mar
7 14:01:33 2017 (r314856)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c Tue Mar
7 15:27:23 2017 (r314857)
@@ -924,9 +924,17 @@ spa_taskqs_init(spa_t *spa, zio_type_t t
* The write issue taskq can be extremely CPU
* intensive. Run it at slightly lower priority
* than the other taskqs.
+ * FreeBSD notes:
+ * - numerically higher priorities are lower priorities;
+ * - if priorities divided by four (RQ_PPQ) are equal
+ * then a difference between them is insignificant.
*/
if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE)
- pri++;
+#ifdef illumos
+ pri--;
+#else
+ pri += 4;
+#endif
tq = taskq_create_proc(name, value, pri, 50,
INT_MAX, spa->spa_proc, flags);
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