Author: mav
Date: Sat Oct 3 11:05:58 2015
New Revision: 288579
URL: https://svnweb.freebsd.org/changeset/base/288579
Log:
Restore original array_rd_sz semantics.
Before r278702 prefetch was blocked for I/Os > 1MB, after -- >= 1MB.
1MB I/Os are used for bulk operations in CTL (XCOPY, VERIFY), and disabling
prefetch for them reduced the performance.
This is temporary local patch, that should be replaced when upstreamed.
Discussed with: mahrens
MFC after: 3 days
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Sat Oct 3
09:47:29 2015 (r288578)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c Sat Oct 3
11:05:58 2015 (r288579)
@@ -449,7 +449,7 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn,
}
if ((flags & DMU_READ_NO_PREFETCH) == 0 && read &&
- length < zfetch_array_rd_sz) {
+ length <= zfetch_array_rd_sz) {
dmu_zfetch(&dn->dn_zfetch, blkid, nblks);
}
rw_exit(&dn->dn_struct_rwlock);
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