Greeting, FYI, we noticed a 57.3% improvement of will-it-scale.per_process_ops due to commit: commit: 3510ca20ece0150af6b10c77a74ff1b5c198e3e2 ("Minor page waitqueue cleanups") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: will-it-scale on test machine: 72 threads Intel(R) Xeon(R) CPU E5-2699 v3 @ 2.30GHz with 128G memory with following parameters: nr_task: 100% mode: process test: pread2 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 https://github.com/01org/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/100%-process-pread2-performance/lkp-hsw-ep4 0cc3b0ec23ce4c69 3510ca20ece0150af6b10c77a7 ---------------- -------------------------- %stddev change %stddev \ | \ 6671 57% 10495 will-it-scale.per_process_ops 468302 40% 657813 vmstat.system.cs 14.64 53% 22.42 perf-stat.cache-miss-rate% 1.42e+08 41% 1.996e+08 perf-stat.context-switches 1.826e+09 39% 2.546e+09 perf-stat.iTLB-loads 8.607e+08 39% 1.198e+09 perf-stat.node-store-misses 2.482e+11 35% 3.361e+11 perf-stat.dTLB-stores 0.34 33% 0.45 ± 3% perf-stat.branch-miss-rate% 3.512e+09 28% 4.49e+09 perf-stat.branch-misses 3.972e+09 26% 4.992e+09 perf-stat.cache-misses 2.475e+09 24% 3.067e+09 perf-stat.node-load-misses 6.177e+08 14% 7.073e+08 perf-stat.node-stores 14841 ± 10% 13% 16765 ± 3% perf-stat.instructions-per-iTLB-miss 58.21 8% 62.87 perf-stat.node-store-miss-rate% 36936 6% 39270 perf-stat.cpu-migrations 0.29 6% 0.31 perf-stat.ipc 1.032e+12 -4% 9.917e+11 perf-stat.branch-instructions 3.40 -6% 3.20 perf-stat.cpi 1.472e+13 -7% 1.363e+13 ± 3% perf-stat.cpu-cycles 2.965e+08 ± 13% -14% 2.543e+08 perf-stat.iTLB-load-misses 2.714e+10 -18% 2.226e+10 perf-stat.cache-references 2.191e+08 ± 4% -24% 1.667e+08 perf-stat.dTLB-store-misses 13.95 ± 12% -35% 9.08 perf-stat.iTLB-load-miss-rate% 0.09 ± 4% -44% 0.05 perf-stat.dTLB-store-miss-rate% 0.11 ± 36% -54% 0.05 ± 5% perf-stat.dTLB-load-miss-rate% 1.247e+09 ± 37% -55% 5.627e+08 ± 4% perf-stat.dTLB-load-misses 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