Author: mav
Date: Mon Oct 12 14:27:27 2015
New Revision: 289188
URL: https://svnweb.freebsd.org/changeset/base/289188
Log:
6281 prefetching should apply to 1MB reads
Reviewed by: Matthew Ahrens <mahr...@delphix.com>
Reviewed by: Paul Dagnelie <p...@delphix.com>
Reviewed by: Alexander Motin <m...@freebsd.org>
Reviewed by: Dan McDonald <dan...@omniti.com>
Reviewed by: Justin Gibbs <gi...@scsiguy.com>
Reviewed by: Xin Li <delp...@freebsd.org>
Approved by: Gordon Ross <gordon.r...@nexenta.com>
Author: George Wilson <george.wil...@delphix.com>
illumos/illumos-gate@632802744ef6d17e06d6980a95f631615c3b060f
Modified:
vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c
vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_zfetch.c
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Mon Oct 12 14:24:11
2015 (r289187)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Mon Oct 12 14:27:27
2015 (r289188)
@@ -442,7 +442,7 @@ 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);
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_zfetch.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_zfetch.c Mon Oct 12
14:24:11 2015 (r289187)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_zfetch.c Mon Oct 12
14:27:27 2015 (r289188)
@@ -24,7 +24,7 @@
*/
/*
- * Copyright (c) 2013, 2014 by Delphix. All rights reserved.
+ * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
@@ -49,7 +49,7 @@ uint32_t zfetch_max_streams = 8;
uint32_t zfetch_min_sec_reap = 2;
/* max bytes to prefetch per stream (default 8MB) */
uint32_t zfetch_max_distance = 8 * 1024 * 1024;
-/* number of bytes in a array_read at which we stop prefetching (1MB) */
+/* max number of bytes in an array_read in which we allow prefetching (1MB) */
uint64_t zfetch_array_rd_sz = 1024 * 1024;
typedef struct zfetch_stats {
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