From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <xiaolong.ye@intel.com>
Date: Mon, 19 Jun 2017 16:52:36 +0800
From: Ye Xiaolong <xiaolong.ye@intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: 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
Message-ID: <20170619085236.GB20152@yexl-desktop>
References: <20170616082755.22832-1-hch@lst.de>
 <20170619060318.GC23108@yexl-desktop>
 <20170619070923.GA13129@lst.de>
 <20170619074943.GA20152@yexl-desktop>
 <20170619084153.GA14788@lst.de>
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In-Reply-To: <20170619084153.GA14788@lst.de>
List-ID: <linux-block@vger.kernel.org>

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

From mboxrd@z Thu Jan  1 00:00:00 1970
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MIME-Version: 1.0
From: Ye Xiaolong <xiaolong.ye@intel.com>
To: lkp@lists.01.org
Subject: Re: [lkp-robot] [scsi] ebc76736f2: fio.write_bw_MBps -4% regression
Date: Mon, 19 Jun 2017 16:52:36 +0800
Message-ID: <20170619085236.GB20152@yexl-desktop>
In-Reply-To: <20170619084153.GA14788@lst.de>
List-Id: <oe-lkp.lists.linux.dev>

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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


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