On Mon, Jan 26 2009, Chilukuri, Harita wrote: > Jens, we did test the patch that disables the whole stats. We get 0.5% gain with this patch on 2.6.29-rc2 comparing to 2.6.29-rc2-disbale_part_stats > > Below is the description of the result: > > Linux OLTP Performance summary > Kernel# Speedup(x) Intr/s CtxSw/s us% sys% idle% iowait% > 2.6.29-rc2-disbale_partition_stats 1.000 30413 42582 74 25 0 0 > 2.6.29-rc2-disable_all 1.005 30401 42656 74 25 0 0 > > Server configurations: > Intel Xeon Quad-core 2.0GHz 2 cpus/8 cores/8 threads > 64GB memory, 3 qle2462 FC HBA, 450 spindles (30 logical units) OK, so about the same, which means the lookup is likely the expensive bit. I have merged this patch: http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=e5b74b703da41fab060adc335a0b98fa5a5ea61d which exposes an 'iostats' toggle that allows users to disable disk statistics completely. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
