FYI, we noticed that piglit.time.percent_of_cpu_this_job_got -36.2% change with your commit. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 97f9010af05c15e0b7e6b4ef6ff8cb0ebb7e7715 ("drm/i915: mdelay(10) considered harmful") ========================================================================================= compiler/group/kconfig/rootfs/tbox_group/testcase: gcc-4.9/igt-037/x86_64-rhel/debian-x86_64-2015-02-07.cgz/snb-drag/piglit commit: 57a2af6bbc7a4f1b145cc216c34476402836f0b8 97f9010af05c15e0b7e6b4ef6ff8cb0ebb7e7715 57a2af6bbc7a4f1b 97f9010af05c15e0b7e6b4ef6f ---------------- -------------------------- fail:runs %reproduction fail:runs %stddev %change %stddev \ | \ 69.00 ± 0% -36.2% 44.00 ± 0% piglit.time.percent_of_cpu_this_job_got 44.77 ± 0% -36.0% 28.66 ± 0% piglit.time.system_time 38337 ± 0% +4.1% 39904 ± 0% piglit.time.voluntary_context_switches 69.00 ± 0% -36.2% 44.00 ± 0% time.percent_of_cpu_this_job_got 44.77 ± 0% -36.0% 28.66 ± 0% time.system_time snb-drag: Sandy Bridge Memory: 6G piglit.time.system_time 46 ++---------------------------------------------------------------------+ *..*..*..*..*..*..*..*..*..*..*..*..*.*..*..*..*..*..*..*..*..*..* | 44 ++ | 42 ++ | | | 40 ++ | 38 ++ | | | 36 ++ | 34 ++ | | | 32 ++ | 30 ++ | 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 28 ++---------------------------------------------------------------------+ piglit.time.percent_of_cpu_this_job_got 70 *+----*--*--*--*--*--*--*--*--*--*--*-*--*--*--*--*--*--*--*--*--*-----+ | .. | 65 ++ * | 60 ++ | | | 55 ++ | 50 ++ | | | 45 ++ O O O O 40 ++ | | O O O O O O O O O O | 35 ++ | 30 ++ | | | 25 O+-O--O--O--O--O--O--O--O--O--O----------------------------------------+ piglit.time.voluntary_context_switches 46000 ++------------------------------------------------------------------+ O O O O O O O O O O O | 45000 ++ | 44000 ++ | | | 43000 ++ | | | 42000 ++ | | | 41000 ++ O O O O O O O O O O | 40000 ++ | | O O O O 39000 ++ | *..*..*..*.*..*..*..*..*..*.*..*..*..*..*..*.*..*..*..*..*..*.* | 38000 ++------------------------------------------------------------------+ [*] 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