Author: mav
Date: Mon Jan 26 16:29:07 2015
New Revision: 277760
URL: https://svnweb.freebsd.org/changeset/base/277760
Log:
MFC r277096: Skip extra bcopy() when scrubbing vdev without redundancy.
According to profiler, this bcopy() can use about 10% of CPU time.
Modified:
stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
Mon Jan 26 16:26:28 2015 (r277759)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c
Mon Jan 26 16:29:07 2015 (r277760)
@@ -441,7 +441,8 @@ 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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