linux-kernel - Re: [LKP] [aio] 6098b45b32e: 2200.00% xfstests.generic.239.seconds

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Date:	Mon, 15 Dec 2014 10:57:53 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Huang Ying <ying.huang@...ux.intel.com>
CC:	Benjamin LaHaise <bcrl@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [aio] 6098b45b32e: 2200.00% xfstests.generic.239.seconds

Hi Huang,
On 12/15/2014 09:02 AM, Huang Ying wrote:

> FYI, we noticed the below changes on
> 
> commit 6098b45b32e6baeacc04790773ced9340601d511 ("aio: block exit_aio() until all context requests are completed")

This patch added a wait step (which is lacked before) for all submitted aio
missions (iocbs) to complete in exit_aio(), so the cost-time increasing is
expected.

Thanks,
Gu

> 
> 
> testbox/testcase/testparams: vm-vp-2G/xfstests/4HDD-btrfs-generic-quick
> 
> 2ff396be602f10b5  6098b45b32e6baeacc04790773  
> ----------------  --------------------------  
>          %stddev     %change         %stddev
>              \          |                \  
>      26352 ±  9%     -13.6%      22774 ±  1%  vmstat.system.cs
>      10342 ±  6%     -12.3%       9066 ±  0%  vmstat.system.in
>         37 ±  4%     -12.1%         32 ±  3%  time.percent_of_cpu_this_job_got
>       1197 ±  2%     -14.2%       1028 ±  0%  vmstat.io.bi
>      18470 ±  2%     -10.1%      16609 ±  1%  vmstat.io.bo
>        157 ±  3%     +13.7%        179 ±  0%  time.elapsed_time
> 
> vm-vp-2G: qemu-system-x86_64 -enable-kvm -cpu Penryn
> Memory: 2G
> 
>                           xfstests.generic.239.seconds
> 
>   30 ++-----------O---------------------------------------------------------+
>      |              O         O            O         O                      |
>   25 ++                O                                                    |
>      |  O O  O O            O    O O  O  O    O O  O                        |
>      |                   O                                                  |
>   20 O+                                                                     |
>      |                                                                      |
>   15 ++                                                                     |
>      |                                                                      |
>   10 ++                                                                     |
>      |                                                                      |
>      |                                                                      |
>    5 ++                                                                     |
>      |                                                                      |
>    0 *+-*-*--*-*--*-*--*-*--*-*--*-*--*--*-*--*-*--*-*--*-*--*-*--*-*--*-*--*
> 
> 
> 	[*] bisect-good sample
> 	[O] bisect-bad  sample
> 
> To reproduce:
> 
> 	apt-get install ruby ruby-oj
> 	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> 	cd lkp-tests
> 	bin/setup-local job.yaml # the job file attached in this email
> 	bin/run-local   job.yaml
> 
> 
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
> 
> 
> Thanks,
> Fengguang
> 
> 
> 
> 
> _______________________________________________
> LKP mailing list
> LKP@...ux.intel.com
> 


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