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Disable arc_p adapt dampener by default
It's unclear why adjustments to arc_p need to be dampened as they are in arc_adjust. With that said, it's removal significantly improves the arc's ability to "warm up" to a given workload. Thus, I'm disabling by default until its usefulness is better understood. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2110
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@ -304,6 +304,17 @@ Disable aggressive arc_p growth
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Use \fB1\fR for yes (default) and \fB0\fR to disable.
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Use \fB1\fR for yes (default) and \fB0\fR to disable.
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.RE
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.RE
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.sp
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.ne 2
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.na
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\fBzfs_arc_p_dampener_disable\fR (int)
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.ad
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.RS 12n
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Disable arc_p adapt dampener
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.sp
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Use \fB1\fR for yes (default) and \fB0\fR to disable.
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.RE
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.sp
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.sp
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.ne 2
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.ne 2
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.na
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.na
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@ -175,6 +175,9 @@ int zfs_arc_grow_retry = 5;
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/* disable anon data aggressively growing arc_p */
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/* disable anon data aggressively growing arc_p */
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int zfs_arc_p_aggressive_disable = 1;
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int zfs_arc_p_aggressive_disable = 1;
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/* disable arc_p adapt dampener in arc_adapt */
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int zfs_arc_p_dampener_disable = 1;
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/* log2(fraction of arc to reclaim) */
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/* log2(fraction of arc to reclaim) */
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int zfs_arc_shrink_shift = 5;
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int zfs_arc_shrink_shift = 5;
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@ -2633,6 +2636,8 @@ arc_adapt(int bytes, arc_state_t *state)
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if (state == arc_mru_ghost) {
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if (state == arc_mru_ghost) {
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mult = ((arc_mru_ghost->arcs_size >= arc_mfu_ghost->arcs_size) ?
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mult = ((arc_mru_ghost->arcs_size >= arc_mfu_ghost->arcs_size) ?
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1 : (arc_mfu_ghost->arcs_size/arc_mru_ghost->arcs_size));
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1 : (arc_mfu_ghost->arcs_size/arc_mru_ghost->arcs_size));
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if (!zfs_arc_p_dampener_disable)
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mult = MIN(mult, 10); /* avoid wild arc_p adjustment */
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mult = MIN(mult, 10); /* avoid wild arc_p adjustment */
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arc_p = MIN(arc_c, arc_p + bytes * mult);
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arc_p = MIN(arc_c, arc_p + bytes * mult);
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@ -2641,6 +2646,8 @@ arc_adapt(int bytes, arc_state_t *state)
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mult = ((arc_mfu_ghost->arcs_size >= arc_mru_ghost->arcs_size) ?
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mult = ((arc_mfu_ghost->arcs_size >= arc_mru_ghost->arcs_size) ?
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1 : (arc_mru_ghost->arcs_size/arc_mfu_ghost->arcs_size));
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1 : (arc_mru_ghost->arcs_size/arc_mfu_ghost->arcs_size));
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if (!zfs_arc_p_dampener_disable)
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mult = MIN(mult, 10);
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mult = MIN(mult, 10);
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delta = MIN(bytes * mult, arc_p);
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delta = MIN(bytes * mult, arc_p);
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@ -5554,6 +5561,9 @@ MODULE_PARM_DESC(zfs_arc_grow_retry, "Seconds before growing arc size");
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module_param(zfs_arc_p_aggressive_disable, int, 0644);
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module_param(zfs_arc_p_aggressive_disable, int, 0644);
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MODULE_PARM_DESC(zfs_arc_p_aggressive_disable, "disable aggressive arc_p grow");
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MODULE_PARM_DESC(zfs_arc_p_aggressive_disable, "disable aggressive arc_p grow");
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module_param(zfs_arc_p_dampener_disable, int, 0644);
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MODULE_PARM_DESC(zfs_arc_p_dampener_disable, "disable arc_p adapt dampener");
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module_param(zfs_arc_shrink_shift, int, 0644);
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module_param(zfs_arc_shrink_shift, int, 0644);
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MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)");
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MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)");
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