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6281 prefetching should apply to 1MB reads

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Alexander Motin <mav@freebsd.org>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Justin Gibbs <gibbs@scsiguy.com>
Reviewed by: Xin Li <delphij@freebsd.org>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
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grwilson authored and ahrens committed Oct 7, 2015
1 parent 7205e71 commit 632802744ef6d17e06d6980a95f631615c3b060f
Showing with 3 additions and 3 deletions.
  1. +1 −1 usr/src/uts/common/fs/zfs/dmu.c
  2. +2 −2 usr/src/uts/common/fs/zfs/dmu_zfetch.c
@@ -442,7 +442,7 @@ 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);
@@ -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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