On 06/19, Christoph Hellwig wrote: >On Mon, Jun 19, 2017 at 03:49:43PM +0800, Ye Xiaolong wrote: >> On 06/19, Christoph Hellwig wrote: >> >On Mon, Jun 19, 2017 at 02:03:18PM +0800, kernel test robot wrote: >> >> >> >> Greeting, >> >> >> >> FYI, we noticed a -4% regression of fio.write_bw_MBps due to commit: >> > >> >What does cat /sys/block/<device>/queue/scheduler say for your test? >> >Can you try with mq-deadline or bfq and see what the results are? >> >> Could you tell me how to do it? via changing kernel config? > >BFQ doesn't seem to be enabled in the config, so it would have to be >enabled. > >I've not seen a compile-time option for the MQ I/O scheduler (unlike >the legacy one), so the way to change it would be to echo the name to >/sys/block/<device>/queue/scheduler echo mq-deadline > /sys/block/<device>/queue/scheduler ? I'll try and post the results once I get it. Thanks, Xiaolong
