FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 2def4ad99befa25775dd2f714fdd4d92faec6e34 ("drm/i915: Optimistically spin for the request completion")


=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/cpufreq_governor/group:
  lkp-t410/piglit/debian-x86_64-2015-02-07.cgz/x86_64-rhel/gcc-4.9/performance/igt-052

commit: 
  a1b2278e4dfcd2dbea85e319ebf73a6b7b2f180b
  2def4ad99befa25775dd2f714fdd4d92faec6e34

a1b2278e4dfcd2db 2def4ad99befa25775dd2f714f 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      6.00 ±  0%    +116.7%      13.00 ±  0%  piglit.time.percent_of_cpu_this_job_got
      6.71 ±  0%    +182.8%      18.96 ±  0%  piglit.time.system_time
      5598 ±  0%      +2.1%       5718 ±  0%  vmstat.system.in
      6.00 ±  0%    +116.7%      13.00 ±  0%  time.percent_of_cpu_this_job_got
      6.71 ±  0%    +182.8%      18.96 ±  0%  time.system_time
      4.49 ±  0%     -26.1%       3.32 ±  0%  time.user_time


lkp-t410: Westmere
Memory: 2G


                             piglit.time.system_time

  20 ++---------------------------------------------------------------------+
  18 O+O O O O O  O O O O O O O O O O O  O O O O O O O O                    |
     |                                                                      |
  16 ++                                                                     |
  14 ++                                                                     |
     |                                                                      |
  12 ++                                                                     |
  10 ++                                                                     |
   8 ++                                                                     |
     *         *..*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*
   6 ++        :                                                            |
   4 ++       :                                                             |
     |:       :                                                             |
   2 ++:     :                                                              |
   0 ++*-*-*-*--------------------------------------------------------------+


                     piglit.time.percent_of_cpu_this_job_got

  14 ++---------------------------------------------------------------------+
     O O O O O O  O O O O O O   O O O O  O O O O O O O O                    |
  12 ++                       O                                             |
     |                                                                      |
  10 ++                                                                     |
     |                                                                      |
   8 ++                                                                     |
     |                                                                      |
   6 *+        *..*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*
     |         :                                                            |
   4 ++       :                                                             |
     |:       :                                                             |
   2 ++       :                                                             |
     | :     :                                                              |
   0 ++*-*-*-*--------------------------------------------------------------+


                                  time.user_time

    5 ++--------------------------------------------------------------------+
  4.5 ++             .*..*.                             .*..           .*.*.*
      *         *.*.*      *.*.*.*.*.*.*.*.*.*.*.*.*.*.*    *.*.*.*.*.*     |
    4 ++        :                                                           |
  3.5 ++      O :                              O                            |
      O:O O O   O O O O  O O O O O O O O O O O   O O O O                    |
    3 ++       :                                                            |
  2.5 ++       :                                                            |
    2 ++       :                                                            |
      |:       :                                                            |
  1.5 ++       :                                                            |
    1 ++:      :                                                            |
      | :     :                                                             |
  0.5 ++:     :                                                             |
    0 ++*-*-*-*-------------------------------------------------------------+


                                time.system_time

  20 ++---------------------------------------------------------------------+
  18 O+O O O O O  O O O O O O O O O O O  O O O O O O O O                    |
     |                                                                      |
  16 ++                                                                     |
  14 ++                                                                     |
     |                                                                      |
  12 ++                                                                     |
  10 ++                                                                     |
   8 ++                                                                     |
     *         *..*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*
   6 ++        :                                                            |
   4 ++       :                                                             |
     |:       :                                                             |
   2 ++:     :                                                              |
   0 ++*-*-*-*--------------------------------------------------------------+


                        time.percent_of_cpu_this_job_got

  14 ++---------------------------------------------------------------------+
     O O O O O O  O O O O O O   O O O O  O O O O O O O O                    |
  12 ++                       O                                             |
     |                                                                      |
  10 ++                                                                     |
     |                                                                      |
   8 ++                                                                     |
     |                                                                      |
   6 *+        *..*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*.*.*.*.*.*.*..*.*.*.*.*.*
     |         :                                                            |
   4 ++       :                                                             |
     |:       :                                                             |
   2 ++       :                                                             |
     | :     :                                                              |
   0 ++*-*-*-*--------------------------------------------------------------+

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

To reproduce:

	apt-get install ruby
	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,
Ying Huang
-------------------------------------
lkp@eclists.intel.com
https://eclists.intel.com/sympa/info/lkp
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