Greeting, There is no primary kpi change in this test, below is the data collected through multiple monitors running background just for your information. commit: 9b910e3e99df68ea86a210298a9c1bc8cead194e ("rcu: Remove short-term CPU kicking") https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master in testcase: will-it-scale on test machine: 144 threads Intel(R) Xeon(R) CPU E7-8890 v3 @ 2.50GHz with 128G memory with following parameters: test: brk1 cpufreq_governor: performance test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two. test-url: https://github.com/antonblanchard/will-it-scale Details are as below: --------------------------------------------------------------------------------------------------> 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 testcase/path_params/tbox_group/run: will-it-scale/brk1-performance/lkp-hsx02 58bdd5f9c975c791 9b910e3e99df68ea86a210298a ---------------- -------------------------- %stddev change %stddev \ | \ 2983150 2939406 will-it-scale.per_process_ops 1975 ± 12% 54% 3049 will-it-scale.time.percent_of_cpu_this_job_got 7126 ± 5% 49% 10626 ± 5% will-it-scale.time.system_time 28901060 ± 23% -62% 10852679 ± 43% will-it-scale.time.voluntary_context_switches 157730 ± 16% -60% 62551 ± 37% vmstat.system.cs 5.348e+13 17% 6.23e+13 ± 3% perf-stat.cpu-cycles 1.192e+13 12% 1.337e+13 perf-stat.branch-instructions 84.77 8% 91.30 perf-stat.node-store-miss-rate% 4.712e+13 8% 5.067e+13 perf-stat.instructions 0.88 -8% 0.81 perf-stat.ipc 15476 ± 3% -11% 13707 perf-stat.cpu-migrations 5.955e+08 ± 16% -25% 4.461e+08 ± 16% perf-stat.node-store-misses 1.113e+09 ± 8% -33% 7.494e+08 ± 7% perf-stat.branch-misses 7.08e+09 ± 15% -34% 4.656e+09 ± 14% perf-stat.cache-references 2.189e+09 ± 18% -37% 1.378e+09 ± 15% perf-stat.cache-misses 0.01 ± 10% -40% 0.01 ± 5% perf-stat.branch-miss-rate% 1.402e+09 ± 18% -40% 8.391e+08 ± 15% perf-stat.node-load-misses 2.766e+08 ± 14% -41% 1.63e+08 ± 12% perf-stat.iTLB-loads 29599426 ± 21% -58% 12486919 ± 9% perf-stat.node-loads 1.075e+08 ± 20% -60% 42574032 ± 20% perf-stat.node-stores 58322446 ± 23% -62% 22329583 ± 42% perf-stat.context-switches will-it-scale.time.percent_of_cpu_this_job_got 3200 ++-------------------------------------------------------------------+ | O O O O O O O O O O O | 3000 O+ O O O O O O O O O O O O O O O O O O O 2800 ++ | | | 2600 ++ | | * | 2400 ++ :: | | : : *.. * | 2200 ++ : :+ * :: | 2000 ++ : * *.*.*..* : : : : | | *.*.*..* : : : : : | 1800 ++ .. : : : * | *.* *. : * | 1600 ++------------------------------*------------------------------------+ perf-stat.cpu-cycles 6.6e+13 ++--------------------------------------------------------------O-+ | O O O | 6.4e+13 ++ O O | 6.2e+13 ++ O O O O O O | O O O O O O O O O | 6e+13 ++O O O O O O O O | | O O 5.8e+13 ++ | | | 5.6e+13 ++ | 5.4e+13 *+ .*.. .* *. .* | | * * + + *. + .*. .*.. .*.*.*..* | 5.2e+13 ++ * * * *.* | | | 5e+13 ++----------------------------------------------------------------+ will-it-scale.time.system_time 12000 ++------------------------------------------------------------------+ | O O | 11000 ++ O O O O | O O O O O O O O O | | O O O O O O O O O O | 10000 ++O O O O O O | | 9000 ++ | | | 8000 ++ * | | + + .*. * | *. .*.*.*. + * *..*.*.* *. .. + | 7000 ++*. * + + * * | | *..* | 6000 ++------------------------------------------------------------------+ [*] bisect-good sample [O] bisect-bad sample 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