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d393166c54
Before parallel eviction implementation zfs_arc_evict_batch_limit caused loop exits after evicting 10 headers. The cost of it is not big and well motivated. Now though taskq task exit after the same 10 headers is much more expensive. To cover the context switch overhead of taskq introduce another level of batching, controlled by zfs_arc_evict_batches_limit tunable, used only for parallel eviction. My tests including 36 parallel reads with 4KB recordsize that shown 1.4GB/s (~460K blocks/s) before with heavy arc_evict_lock contention, now show 6.5GB/s (~1.6M blocks/s) without arc_evict_lock contention. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #17970 |
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