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Improve ARC hit rate with metadata heavy workloads #2110

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Improve ARC hit rate with metadata heavy workloads #2110

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8e82b07
Set zfs_arc_min to 4MB
behlendorf Jul 23, 2013
7364874
Adjust arc_p based on "bytes" in arc_shrink
Dec 11, 2013
00fc78f
Disable aggressive arc_p growth by default
Dec 11, 2013
fdd21ca
Allow "arc_p" to drop to zero or grow to "arc_c"
Jan 3, 2014
f5ee929
Disable arc_p adapt dampener by default
Jan 3, 2014
cd661cd
Revert "Return -1 from arc_shrinker_func()"
Dec 23, 2013
d03b1ff
Prune metadata from ghost lists in arc_adjust_meta
Jan 3, 2014
863f942
Remove "arc_meta_used" from arc_adjust calculation
Jan 3, 2014
4287966
Prioritize "metadata" in arc_get_data_buf
Dec 30, 2013
2075bac
Split "data_size" into "meta" and "data"
Feb 3, 2014
1ff06b8
Set "arc_meta_limit" to 3/4 arc_c_max by default
Feb 3, 2014
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2 changes: 1 addition & 1 deletion include/sys/arc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,7 @@ typedef enum arc_buf_contents {
*/
typedef enum arc_space_type {
ARC_SPACE_DATA,
ARC_SPACE_META,
ARC_SPACE_HDRS,
ARC_SPACE_L2HDRS,
ARC_SPACE_OTHER,
Expand Down Expand Up @@ -160,7 +161,6 @@ void arc_freed(spa_t *spa, const blkptr_t *bp);
void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
int arc_buf_evict(arc_buf_t *buf);

void arc_adjust_meta(int64_t adjustment, boolean_t may_prune);
void arc_flush(spa_t *spa);
void arc_tempreserve_clear(uint64_t reserve);
int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
Expand Down
22 changes: 22 additions & 0 deletions man/man5/zfs-module-parameters.5
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Original file line number Diff line number Diff line change
Expand Up @@ -304,6 +304,28 @@ arc_c shift to calc min/max arc_p
Default value: \fB4\fR.
.RE

.sp
.ne 2
.na
\fBzfs_arc_p_aggressive_disable\fR (int)
.ad
.RS 12n
Disable aggressive arc_p growth
.sp
Use \fB1\fR for yes (default) and \fB0\fR to disable.
.RE

.sp
.ne 2
.na
\fBzfs_arc_p_dampener_disable\fR (int)
.ad
.RS 12n
Disable arc_p adapt dampener
.sp
Use \fB1\fR for yes (default) and \fB0\fR to disable.
.RE

.sp
.ne 2
.na
Expand Down
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