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Change the default 'zfs_dedup_prefetch' value to '0'

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This gives a huge performance improvement in operations with deduped
datasets especially when the bottleneck is the amount of ram
available for zfs.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2639
This commit is contained in:
Alexey Smirnoff 2014-08-30 09:13:26 +07:00 committed by Brian Behlendorf
parent 287be44f53
commit 0dfc732416
2 changed files with 2 additions and 2 deletions
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2
man/man5/zfs-module-parameters.5
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@ -503,7 +503,7 @@ Default value: \fB1,000,000\fR.
.RS 12n
Enable prefetching dedup-ed blks
.sp
Use \fB1\fR for yes (default) and \fB0\fR to disable.
Use \fB1\fR for yes and \fB0\fR to disable (default).
.RE
.sp

2
module/zfs/ddt.c
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@ -43,7 +43,7 @@ static kmem_cache_t *ddt_entry_cache;
/*
* Enable/disable prefetching of dedup-ed blocks which are going to be freed.
*/
int zfs_dedup_prefetch = 1;
int zfs_dedup_prefetch = 0;
static const ddt_ops_t *ddt_ops[DDT_TYPES] = {
&ddt_zap_ops,