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From: Ye Xiaolong <xiaolong.ye@intel.com>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	LKML <linux-kernel@vger.kernel.org>,
	James Bottomley <JBottomley@odin.com>,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Linux SCSI List <linux-scsi@vger.kernel.org>, LKP ML <lkp@01.org>
Subject: Re: [lkp-robot] [scsi] 5c279bd9e4: blogbench.read_score -10.0% regression
Date: Thu, 6 Jul 2017 10:54:21 +0800	[thread overview]
Message-ID: <20170706025421.GB5222@yexl-desktop> (raw)
In-Reply-To: <CACVXFVNWpWb0f-tp2r82Juzq3QH2Prw_gzqVY9tySnAQsLg2Kg@mail.gmail.com>

Hi, Ming Lei

On 07/06, Ming Lei wrote:
>Hi Xiaolong,
>
>On Mon, Jul 3, 2017 at 10:57 AM, kernel test robot
><xiaolong.ye@intel.com> wrote:
>>
>> Greeting,
>>
>> FYI, we noticed a -10.0% regression of blogbench.read_score due to commit:
>
>Looks like related with mq scheduler, could you test the following patch to see
>if your issue can be fixed?
>
>https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-linus&id=32825c45ff8f4cce937ab85b030dc693ceb1aa0a
>

Here is the comparison of commit 5c279bd9e4 and 32825c45, it does help recover
performance back.

$ compare -at 5c279bd9e40624f4ab6e688671026d6005b066fa 32825c45ff8f4cce937ab85b030dc693ceb1aa0a
tests: 1
testcase/path_params/tbox_group/run: blogbench/1SSD-ext4-performance/lkp-bdw-de1

5c279bd9e40624f4  32825c45ff8f4cce937ab85b03  
----------------  --------------------------  
         %stddev      change         %stddev
             \          |                \  
    262860              36%     358558        blogbench.read_score
      9913 ±  4%       -33%       6654        blogbench.write_score
  86266452              31%  1.129e+08        blogbench.time.file_system_inputs
     29.89              22%      36.46        blogbench.time.user_time
       214              13%        242        blogbench.time.percent_of_cpu_this_job_got
       620              12%        696        blogbench.time.system_time
  1.11e+08             -29%   79019314        blogbench.time.file_system_outputs
    439016             -69%     135286        blogbench.time.involuntary_context_switches
      0.64              22%       0.78        mpstat.cpu.usr%
      7.02 ±  4%       -47%       3.72        mpstat.cpu.idle%
    237216            1344%    3425183        softirqs.RCU
    430504             376%    2048486        softirqs.TIMER
    188376             211%     586308        softirqs.SCHED
    306478 ± 32%       -99%       4150 ± 36%  softirqs.NET_RX
  86266452              31%  1.129e+08        time.file_system_inputs
     29.89              22%      36.46        time.user_time

Thanks,
Xiaolong

>
>Thanks,
>Ming Lei

WARNING: multiple messages have this Message-ID (diff)
From: Ye Xiaolong <xiaolong.ye@intel.com>
To: lkp@lists.01.org
Subject: Re: [lkp-robot] [scsi] 5c279bd9e4: blogbench.read_score -10.0% regression
Date: Thu, 06 Jul 2017 10:54:21 +0800	[thread overview]
Message-ID: <20170706025421.GB5222@yexl-desktop> (raw)
In-Reply-To: <CACVXFVNWpWb0f-tp2r82Juzq3QH2Prw_gzqVY9tySnAQsLg2Kg@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 2172 bytes --]

Hi, Ming Lei

On 07/06, Ming Lei wrote:
>Hi Xiaolong,
>
>On Mon, Jul 3, 2017 at 10:57 AM, kernel test robot
><xiaolong.ye@intel.com> wrote:
>>
>> Greeting,
>>
>> FYI, we noticed a -10.0% regression of blogbench.read_score due to commit:
>
>Looks like related with mq scheduler, could you test the following patch to see
>if your issue can be fixed?
>
>https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-linus&id=32825c45ff8f4cce937ab85b030dc693ceb1aa0a
>

Here is the comparison of commit 5c279bd9e4 and 32825c45, it does help recover
performance back.

$ compare -at 5c279bd9e40624f4ab6e688671026d6005b066fa 32825c45ff8f4cce937ab85b030dc693ceb1aa0a
tests: 1
testcase/path_params/tbox_group/run: blogbench/1SSD-ext4-performance/lkp-bdw-de1

5c279bd9e40624f4  32825c45ff8f4cce937ab85b03  
----------------  --------------------------  
         %stddev      change         %stddev
             \          |                \  
    262860              36%     358558        blogbench.read_score
      9913 ±  4%       -33%       6654        blogbench.write_score
  86266452              31%  1.129e+08        blogbench.time.file_system_inputs
     29.89              22%      36.46        blogbench.time.user_time
       214              13%        242        blogbench.time.percent_of_cpu_this_job_got
       620              12%        696        blogbench.time.system_time
  1.11e+08             -29%   79019314        blogbench.time.file_system_outputs
    439016             -69%     135286        blogbench.time.involuntary_context_switches
      0.64              22%       0.78        mpstat.cpu.usr%
      7.02 ±  4%       -47%       3.72        mpstat.cpu.idle%
    237216            1344%    3425183        softirqs.RCU
    430504             376%    2048486        softirqs.TIMER
    188376             211%     586308        softirqs.SCHED
    306478 ± 32%       -99%       4150 ± 36%  softirqs.NET_RX
  86266452              31%  1.129e+08        time.file_system_inputs
     29.89              22%      36.46        time.user_time

Thanks,
Xiaolong

>
>Thanks,
>Ming Lei

  reply	other threads:[~2017-07-06  2:54 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-03  2:57 [lkp-robot] [scsi] 5c279bd9e4: blogbench.read_score -10.0% regression kernel test robot
2017-07-03  2:57 ` kernel test robot
2017-07-05 23:45 ` Ming Lei
2017-07-05 23:45   ` Ming Lei
2017-07-06  2:54   ` Ye Xiaolong [this message]
2017-07-06  2:54     ` Ye Xiaolong
2017-07-06  7:12     ` Ming Lei
2017-07-06  7:12       ` Ming Lei

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