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022bf86370
Current L2ARC write rate and headroom parameters are very conservative: l2arc_write_max=8M and l2arc_headroom=2 (ie: a full L2ARC writes at 8 MB/s, scanning 16/32 MB of ARC tail each time; a warming L2ARC runs at 2x these rates). These values were selected 15+ years ago based on then-current SSDs size, performance and endurance. Today we have multi-TB, fast and cheap SSDs which can sustain much higher read/write rates. For this reason, this patch increases l2arc_write_max to 32M and l2arc_headroom to 8 (4x increase for both). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Gionatan Danti <g.danti@assyoma.it> Closes #15457 |
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