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Restore original array_rd_sz semantics.

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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
This commit is contained in:
Alexander Motin 2015-10-03 11:05:58 +00:00
parent f1aaad0cd9
commit ec5a8cf7c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=288579
1 changed files with 1 additions and 1 deletions
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2
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
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@ -449,7 +449,7 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
}
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);