linux-kernel - [lkp] [drm/dp_helper] 31f8862c6e: No primary result change, 128.2% piglit.time.voluntary_context

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Date:	Mon, 21 Mar 2016 14:53:24 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Lyude <cpaul@...hat.com>
Cc:	0day robot <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [drm/dp_helper] 31f8862c6e: No primary result change, 128.2%
 piglit.time.voluntary_context_switches

FYI, we noticed that piglit.time.voluntary_context_switches +917.2% change with your commit.

https://github.com/0day-ci/linux Lyude/drm-dp_helper-retry-on-ETIMEDOUT-in-drm_dp_dpcd_access/20160317-234351
commit 31f8862c6e6303223e946e6fcbdfa7f87274baef ("drm/dp_helper: retry on -ETIMEDOUT in drm_dp_dpcd_access()")


=========================================================================================
compiler/group/kconfig/rootfs/tbox_group/testcase:
  gcc-4.9/igt-071/x86_64-rhel/debian-x86_64-2015-02-07.cgz/snb-black/piglit

commit: 
  cf481068cdd430a22425d7712c8deeb25efdedc1
  31f8862c6e6303223e946e6fcbdfa7f87274baef

cf481068cdd430a2 31f8862c6e6303223e946e6fcb 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
    111.96 ±  0%    +128.2%     255.52 ±  0%  piglit.time.elapsed_time
    111.96 ±  0%    +128.2%     255.52 ±  0%  piglit.time.elapsed_time.max
      8.25 ±  5%     -39.4%       5.00 ±  0%  piglit.time.percent_of_cpu_this_job_got
     31676 ±  0%    +917.2%     322222 ±  0%  piglit.time.voluntary_context_switches
    111.96 ±  0%    +128.2%     255.52 ±  0%  time.elapsed_time
    111.96 ±  0%    +128.2%     255.52 ±  0%  time.elapsed_time.max
    115.50 ±  1%     +31.2%     151.50 ± 13%  time.involuntary_context_switches
      8.25 ±  5%     -39.4%       5.00 ±  0%  time.percent_of_cpu_this_job_got
      8.31 ±  0%     +45.7%      12.12 ±  0%  time.system_time
     31676 ±  0%    +917.2%     322222 ±  0%  time.voluntary_context_switches


snb-black: Sandy Bridge
Memory: 8G


                       piglit.time.voluntary_context_switches

  350000 ++-----------------------------------------------------------------+
         |                              OO OO                               |
  300000 ++                                                                 |
         |                                                                  |
  250000 ++                                                                 |
         |                                                                  |
  200000 ++                                                                 |
         |                                                                  |
  150000 ++                                                                 |
         |                                                                  |
  100000 OO OO OO OO OO OOO OO OO OO OO                                     |
         |                                                                  |
   50000 ++                                                                 |
         **.**.**. *.**.***.**.**.**.**.**.***.**.**.**.**.***.**.**.**.**.**
       0 ++-------*---------------------------------------------------------+


	[*] bisect-good sample
	[O] bisect-bad  sample

To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     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,
Xiaolong Ye.

View attachment "job.yaml" of type "text/plain" (2868 bytes)

View attachment "reproduce" of type "text/plain" (182 bytes)