FYI, we noticed that unixbench.time.involuntary_context_switches -25.5% change with your commit. https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent commit dabbd61e79c918f1d8a31598a678bc04e042faf8 ("sched,fair: Fix fairness issue on migrate") ========================================================================================= compiler/cpufreq_governor/kconfig/nr_task/rootfs/tbox_group/test/testcase: gcc-4.9/performance/x86_64-rhel/100%/debian-x86_64-2015-02-07.cgz/lkp-ivb-d01/shell1/unixbench commit: 8ddfc624ef1cf17d19983350e3aa1c413eca98b2 dabbd61e79c918f1d8a31598a678bc04e042faf8 8ddfc624ef1cf17d dabbd61e79c918f1d8a31598a6 ---------------- -------------------------- fail:runs %reproduction fail:runs %stddev %change %stddev \ | \ 2657847 ± 0% -25.5% 1981056 ± 0% unixbench.time.involuntary_context_switches 5863552 ± 0% -9.9% 5283600 ± 0% unixbench.time.voluntary_context_switches 2657847 ± 0% -25.5% 1981056 ± 0% time.involuntary_context_switches 5863552 ± 0% -9.9% 5283600 ± 0% time.voluntary_context_switches 61338 ± 0% -12.6% 53619 ± 0% vmstat.system.cs 11328 ± 0% -4.1% 10864 ± 0% vmstat.system.in 2509602 ± 3% +14.4% 2870105 ± 1% cpuidle.C3-IVB.time 40796 ± 1% +8.3% 44163 ± 3% cpuidle.C3-IVB.usage 9140 ± 9% -42.7% 5234 ± 8% cpuidle.POLL.usage 0.31 ± 10% -20.0% 0.25 ± 0% sched_debug.cfs_rq:/.nr_spread_over.avg 34.51 ± 3% +8.7% 37.52 ± 1% sched_debug.cfs_rq:/.runnable_load_avg.avg 9627 ± 11% +25.2% 12056 ± 6% sched_debug.cpu.curr->pid.avg 11046 ± 6% +24.3% 13726 ± 4% sched_debug.cpu.curr->pid.max 696919 ± 0% -12.4% 610359 ± 0% sched_debug.cpu.nr_switches.avg 721494 ± 1% -13.1% 626954 ± 0% sched_debug.cpu.nr_switches.max 679371 ± 0% -11.7% 599806 ± 0% sched_debug.cpu.nr_switches.min 13857 ± 18% -29.8% 9733 ± 3% sched_debug.cpu.nr_switches.stddev 46.75 ± 79% -137.4% -17.50 ±-151% sched_debug.cpu.nr_uninterruptible.4 79.19 ± 27% -39.2% 48.12 ± 18% sched_debug.cpu.nr_uninterruptible.max -76.06 ±-25% -31.9% -51.81 ±-15% sched_debug.cpu.nr_uninterruptible.min 49.98 ± 15% -30.5% 34.74 ± 18% sched_debug.cpu.nr_uninterruptible.stddev 701565 ± 0% -12.4% 614787 ± 0% sched_debug.cpu.sched_count.avg 749766 ± 0% -12.3% 657902 ± 0% sched_debug.cpu.sched_count.max 679732 ± 0% -11.7% 600230 ± 0% sched_debug.cpu.sched_count.min 22192 ± 7% -17.7% 18262 ± 5% sched_debug.cpu.sched_count.stddev 304372 ± 0% -13.1% 264622 ± 0% sched_debug.cpu.ttwu_count.avg 317048 ± 1% -13.8% 273189 ± 0% sched_debug.cpu.ttwu_count.max 295849 ± 0% -12.1% 260075 ± 0% sched_debug.cpu.ttwu_count.min 6882 ± 20% -38.3% 4248 ± 7% sched_debug.cpu.ttwu_count.stddev 220538 ± 0% -15.7% 185970 ± 0% sched_debug.cpu.ttwu_local.avg 229084 ± 1% -16.4% 191577 ± 1% sched_debug.cpu.ttwu_local.max 215432 ± 0% -14.9% 183288 ± 0% sched_debug.cpu.ttwu_local.min 4627 ± 28% -41.3% 2717 ± 18% sched_debug.cpu.ttwu_local.stddev lkp-ivb-d01: Ivy Bridge Memory: 16G pigz.time.involuntary_context_switches 270000 ++-----------------------------------------------------------------+ 260000 ++ .*.. | *.. .*.. .*..*.. .*.*..*.*. .*..*.*.. * 250000 ++ *. .*.*..* *..*. .* .*. * *. ..| 240000 ++ *. *. * * | | | 230000 ++ | 220000 ++ | 210000 ++ | | | 200000 ++ | 190000 ++ O O O | O O O O O O O O O O O O O O O O O | 180000 ++ O | 170000 ++-----------------------------------------------------------------+ time.involuntary_context_switches 270000 ++-----------------------------------------------------------------+ 260000 ++ .*.. | *.. .*.. .*..*.. .*.*..*.*. .*..*.*.. * 250000 ++ *. .*.*..* *..*. .* .*. * *. ..| 240000 ++ *. *. * * | | | 230000 ++ | 220000 ++ | 210000 ++ | | | 200000 ++ | 190000 ++ O O O | O O O O O O O O O O O O O O O O O | 180000 ++ O | 170000 ++-----------------------------------------------------------------+ unixbench.time.voluntary_context_switches 5.9e+06 ++-----------------*---------------------**--------**---*---------+ *.**.*.**.*.*.**.* *.*.**.*.**.*.*.**.* *.**.* * + .*.**.* 5.8e+06 ++ ** | | | 5.7e+06 ++ | | | 5.6e+06 ++ | | | 5.5e+06 ++ | | | 5.4e+06 ++ | | | 5.3e+06 O+ O OO O O OO OO O OO O O O | | O O O OO O | 5.2e+06 ++----------------------------------------------------------------+ unixbench.time.involuntary_context_switches 2.7e+06 ++----------------------------------------------------------------+ *.**.*.**.*.*.**.*.**.*.**.*.**.*.*.**.*.**.*.**.*.**.*.*.**.*.**.* 2.6e+06 ++ | | | 2.5e+06 ++ | 2.4e+06 ++ | | | 2.3e+06 ++ | | | 2.2e+06 ++ | 2.1e+06 ++ | | | 2e+06 ++ O O O O O | O OO O OO O OO O OO O O O O O | 1.9e+06 ++----------------------------------------------------------------+ time.voluntary_context_switches 5.9e+06 ++-----------------*---------------------**--------**---*---------+ *.**.*.**.*.*.**.* *.*.**.*.**.*.*.**.* *.**.* * + .*.**.* 5.8e+06 ++ ** | | | 5.7e+06 ++ | | | 5.6e+06 ++ | | | 5.5e+06 ++ | | | 5.4e+06 ++ | | | 5.3e+06 O+ O OO O O OO OO O OO O O O | | O O O OO O | 5.2e+06 ++----------------------------------------------------------------+ time.involuntary_context_switches 2.7e+06 ++----------------------------------------------------------------+ *.**.*.**.*.*.**.*.**.*.**.*.**.*.*.**.*.**.*.**.*.**.*.*.**.*.**.* 2.6e+06 ++ | | | 2.5e+06 ++ | 2.4e+06 ++ | | | 2.3e+06 ++ | | | 2.2e+06 ++ | 2.1e+06 ++ | | | 2e+06 ++ O O O O O | O OO O OO O OO O OO O O O O O | 1.9e+06 ++----------------------------------------------------------------+ [*] 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.