On Fri 29-04-16 12:27:56, Waiman Long wrote: > This patch changes the es_stats_cache_hits and es_stats_cache_misses > statistics counts to percpu counters to reduce cacheline contention > issues whem multiple threads are trying to update those counts > simultaneously. > > With a 38-threads fio I/O test with 2 shared files (on DAX-mount > NVDIMM) running on a 4-socket Haswell-EX server with 4.6-rc1 kernel, > the aggregated bandwidths before and after the patch were: > > Test W/O patch With patch % change > ---- --------- ---------- -------- > Read-only 16499MB/s 17215MB/s +4.3% > Read-write 4361MB/s 4794MB/s +9.9% > > Signed-off-by: Waiman Long <Waiman.Long@xxxxxxx> The patch looks good. You can add: Reviewed-by: Jan Kara <jack@xxxxxxx> Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
