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: d7100358d066cd7d64301a2da161390e9f4aa63f ("sched,rcu: Make cond_resched() provide RCU quiescent state") https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2016.11.29e in testcase: will-it-scale on test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz with 64G memory with following parameters: test: unlink2 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/unlink2-performance/ivb42 0fabf6d573c7d95f d7100358d066cd7d64301a2da1 ---------------- -------------------------- %stddev change %stddev \ | \ 23017 ± 4% 227% 75267 will-it-scale.time.involuntary_context_switches 8.71 -7% 8.07 turbostat.RAMWatt 2464 ± 4% 88% 4634 vmstat.system.cs 5858 ± 99% -6e+03 27 ± 29% latency_stats.max.call_rwsem_down_write_failed_killable.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath 6140 ± 99% -6e+03 294 ±138% latency_stats.max.call_rwsem_down_read_failed.__do_page_fault.do_page_fault.page_fault 9362 ± 57% -8e+03 1024 ± 61% latency_stats.max.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath 11959 ± 3% -1e+04 24 ± 45% latency_stats.max.call_rwsem_down_write_failed_killable.do_mprotect_pkey.SyS_mprotect.entry_SYSCALL_64_fastpath 11657 ± 98% -1e+04 105 ± 22% latency_stats.sum.call_rwsem_down_write_failed_killable.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath 16364 ± 39% -2e+04 121 ± 23% latency_stats.sum.call_rwsem_down_write_failed_killable.do_mprotect_pkey.SyS_mprotect.entry_SYSCALL_64_fastpath 31270 ±100% -3e+04 671 ± 85% latency_stats.sum.call_rwsem_down_read_failed.__do_page_fault.do_page_fault.page_fault 662656 ± 81% -5e+05 210805 ± 39% latency_stats.sum.wait_on_page_bit.__migration_entry_wait.migration_entry_wait.do_swap_page.handle_mm_fault.__do_page_fault.do_page_fault.page_fault 761782 ± 4% 89% 1441090 perf-stat.context-switches 31.37 27% 39.72 perf-stat.node-store-miss-rate% 15968 24% 19846 ± 15% perf-stat.cpu-migrations 2.879e+09 ± 4% 18% 3.383e+09 ± 6% perf-stat.node-store-misses 2.162e+12 9% 2.354e+12 ± 4% perf-stat.dTLB-loads 1.176e+08 ± 3% 9% 1.278e+08 perf-stat.iTLB-load-misses 0.34 5% 0.35 perf-stat.ipc 1.773e+12 4% 1.85e+12 perf-stat.branch-instructions 8.478e+12 4% 8.82e+12 perf-stat.instructions 50.04 4% 51.87 perf-stat.iTLB-load-miss-rate% 25.82 -6% 24.18 ± 3% perf-stat.cache-miss-rate% 1.274e+10 ± 3% -7% 1.186e+10 ± 3% perf-stat.cache-misses 6.305e+09 ± 5% -19% 5.13e+09 ± 5% perf-stat.node-stores perf-stat.context-switches 2e+06 ++----------------------------------------------------------------+ | | 1.8e+06 O+ O O O O | | O O | 1.6e+06 ++ O O O | | O O O O O O O | 1.4e+06 ++ O O O O | | | 1.2e+06 ++ | | | 1e+06 ++ .*. | | .*.*.*.*.*..*.* *. .*. .*. .*.* *. * | 800000 *+ .* *.* * * + + *. .. + .*.*. .*. .*.| | * * * * * * * 600000 ++----------------------------------------------------------------+ will-it-scale.time.involuntary_context_switches 100000 ++-----------------------------------------------------------------+ | O O | 90000 O+ | 80000 ++O O | | O O O O O O O O O | 70000 ++ O O O O O O | | O | 60000 ++ | | | 50000 ++ | 40000 ++ .*.. * | | .*. .*.*.*.* + + .*. | 30000 *+*.*.*.*.*..*.*.* * * *.*.* * | | + .*.*.. .*.*. .* 20000 ++----------------------------------------------*-*------*-*-----*-+ vmstat.system.cs 6000 ++-------------------------------------------------------------------+ O O O O O | 5500 ++O O | 5000 ++ O O O | | O O O O O O O | 4500 ++ O O O O | | | 4000 ++ | | | 3500 ++ | 3000 ++ .*.* * | | .*..*.*.*.*.*.*. + + + .*. .*.* *. * | 2500 *+ .* *.* *. * + + *.. + + .*.*. .*. .*.| | * * * * *. * * 2000 ++-------------------------------------------------------------------+ [*] 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