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
