Author: mav
Date: Mon Jan 12 22:38:55 2015
New Revision: 277096
URL: https://svnweb.freebsd.org/changeset/base/277096
Log:
Skip extra bcopy() when scrubbing vdev without redundancy.
According to profiler, this bcopy() can use about 10% of CPU time.
MFC after: 2 weeks
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c Mon Jan
12 22:36:50 2015 (r277095)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c Mon Jan
12 22:38:55 2015 (r277096)
@@ -435,7 +435,8 @@ vdev_mirror_io_start(zio_t *zio)
mm = vdev_mirror_map_init(zio);
if (zio->io_type == ZIO_TYPE_READ) {
- if ((zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_replacing) {
+ if ((zio->io_flags & ZIO_FLAG_SCRUB) && !mm->mm_replacing &&
+ mm->mm_children > 1) {
/*
* For scrubbing reads we need to allocate a read
* buffer for each child and issue reads to all
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