From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [lkp-robot] [scsi] ebc76736f2: fio.write_bw_MBps -4% regression Date: Mon, 19 Jun 2017 10:41:53 +0200 Message-ID: <20170619084153.GA14788@lst.de> References: <20170616082755.22832-1-hch@lst.de> <20170619060318.GC23108@yexl-desktop> <20170619070923.GA13129@lst.de> <20170619074943.GA20152@yexl-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170619074943.GA20152@yexl-desktop> Sender: linux-block-owner@vger.kernel.org To: Ye Xiaolong Cc: Christoph Hellwig , linux-scsi@vger.kernel.org, lkp@01.org, Jens Axboe , linux-block@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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//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//queue/scheduler