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Brian Behlendorf
6a8f9b6bf0
This change ensures the ARC meta-data limits are enforced. Without this enforcement meta-data can grow to consume all of the ARC cache pushing out data and hurting performance. The cache is aggressively reclaimed but this is a soft and not a hard limit. The cache may exceed the set limit briefly before being brought under control. By default 25% of the ARC capacity can be used for meta-data. This limit can be tuned by setting the 'zfs_arc_meta_limit' module option. Once this limit is exceeded meta-data reclaim will occur in 3 percent chunks, or may be tuned using 'arc_reduce_dnlc_percent'. Closes #193