The performance of the L2ARC can be tweaked by a number of tunables, which may be necessary for different workloads: l2arc_write_max max write bytes per interval l2arc_write_boost extra write bytes during device warmup l2arc_noprefetch skip caching prefetched buffers l2arc_headroom number of max device writes to precache l2arc_feed_secs seconds between L2ARC writing l2arc_feed_min_ms min feed interval in milliseconds l2arc_feed_again turbo L2ARC warmup l2arc_norw no reads during writes Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #316