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Obey arc_meta_limit default size when changing arc_max 

When decreasing the maximum ARC size preserve the 3/4 default
ratio for the arc_meta_limit.  Otherwise, the arc_meta_limit
may be set the same as arc_max.

Signed-off-by: AndCycle <andcycle@andcycle.idv.tw>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4001
This commit is contained in:
AndCycle 2015-11-10 22:01:26 +08:00 committed by Ned Bass
parent 2aec0bf4c5
commit 347cdb6e61
1 changed files with 1 additions and 1 deletions
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module/zfs/arc.c
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@ -5250,7 +5250,7 @@ arc_tuning_update(void)
arc_c_max = zfs_arc_max;
arc_c = arc_c_max;
arc_p = (arc_c >> 1);
arc_meta_limit = MIN(arc_meta_limit, arc_c_max);
arc_meta_limit = MIN(arc_meta_limit, (3 * arc_c_max) / 4);
}
/* Valid range: 32M - <arc_c_max> */