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From: Christoph Hellwig <hch@lst.de>
To: Ye Xiaolong <xiaolong.ye@intel.com>
Cc: Christoph Hellwig <hch@lst.de>,
	linux-scsi@vger.kernel.org, lkp@01.org,
	Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org
Subject: Re: [lkp-robot] [scsi]  ebc76736f2: fio.write_bw_MBps -4% regression
Date: Mon, 19 Jun 2017 10:41:53 +0200	[thread overview]
Message-ID: <20170619084153.GA14788@lst.de> (raw)
In-Reply-To: <20170619074943.GA20152@yexl-desktop>

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 

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: lkp@lists.01.org
Subject: Re: [lkp-robot] [scsi] ebc76736f2: fio.write_bw_MBps -4% regression
Date: Mon, 19 Jun 2017 10:41:53 +0200	[thread overview]
Message-ID: <20170619084153.GA14788@lst.de> (raw)
In-Reply-To: <20170619074943.GA20152@yexl-desktop>

[-- Attachment #1: Type: text/plain, Size: 754 bytes --]

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 

  reply	other threads:[~2017-06-19  8:41 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-16  8:27 [PATCH] scsi: default to scsi-mq Christoph Hellwig
2017-06-19  6:03 ` [lkp-robot] [scsi] ebc76736f2: fio.write_bw_MBps -4% regression kernel test robot
2017-06-19  6:03   ` kernel test robot
2017-06-19  7:09   ` Christoph Hellwig
2017-06-19  7:09     ` Christoph Hellwig
2017-06-19  7:09     ` Christoph Hellwig
2017-06-19  7:49     ` Ye Xiaolong
2017-06-19  7:49       ` Ye Xiaolong
2017-06-19  7:49       ` Ye Xiaolong
2017-06-19  8:41       ` Christoph Hellwig [this message]
2017-06-19  8:41         ` Christoph Hellwig
2017-06-19  8:52         ` Ye Xiaolong
2017-06-19  8:52           ` Ye Xiaolong
2017-06-19  9:39           ` Christoph Hellwig
2017-06-19  9:39             ` Christoph Hellwig
2017-06-20  2:16             ` Ye Xiaolong
2017-06-20  2:16               ` Ye Xiaolong
2017-06-20  6:04               ` Christoph Hellwig
2017-06-20  6:04                 ` Christoph Hellwig
2017-06-22 15:05 ` [PATCH] scsi: default to scsi-mq Martin Wilck
2017-06-26  9:48   ` Christoph Hellwig
2017-06-26 12:13   ` Bart Van Assche
2017-06-26 15:31     ` Bart Van Assche
2017-06-26 18:55       ` Martin Wilck
2017-06-27  6:07         ` Bart Van Assche
2017-07-10 15:50 ` Bart Van Assche
2017-07-11 10:22   ` John Garry
2017-07-11 13:32     ` Bart Van Assche
2017-07-11 14:14       ` John Garry
2017-07-11 15:46         ` Bart Van Assche
2017-07-11 17:34           ` John Garry
2017-07-12  8:26             ` John Garry
2017-07-12 14:18               ` Bart Van Assche
2017-07-12 15:54                 ` Jonathan Cameron
2017-07-14  9:56                   ` Jonathan Cameron
2017-07-14 12:45                     ` hch
2017-07-18 15:58                       ` Jonathan Cameron
2017-07-18 16:24                         ` Jonathan Cameron

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