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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 115.4% improvement of stress-ng.pthread.ops_per_sec on: commit: 802182490445f6bcf5de0e0518fb967c2afb6da1 ("pidfs: convert rb-tree to rhashtable") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory parameters: nr_threads: 100% testtime: 60s test: pthread cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260309/202603091347.982f38c4-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-srf-2sp3/pthread/stress-ng/60s commit: a344860211 ("ipc: Add SPDX license id to mqueue.c") 8021824904 ("pidfs: convert rb-tree to rhashtable") a344860211f5c07d 802182490445f6bcf5de0e0518f ---------------- --------------------------- %stddev %change %stddev \ | \ 238962 ± 2% -56.6% 103737 ± 4% stress-ng.pthread.nanosecs_to_start_a_pthread 8502955 +115.5% 18320200 stress-ng.pthread.ops 141479 +115.4% 304813 stress-ng.pthread.ops_per_sec 11806823 +128.1% 26934722 stress-ng.time.involuntary_context_switches 34893919 +112.5% 74144888 stress-ng.time.minor_page_faults 8732 +13.1% 9872 ± 2% stress-ng.time.percent_of_cpu_this_job_got 5152 +11.6% 5748 ± 2% stress-ng.time.system_time 119.70 +79.2% 214.54 stress-ng.time.user_time 17274026 +115.2% 37181651 stress-ng.time.voluntary_context_switches 2.536e+09 ± 2% +27.7% 3.237e+09 cpuidle..time 11624156 +112.2% 24669418 ± 2% cpuidle..usage 21.06 ± 2% +6.3 27.39 mpstat.cpu.all.idle% 0.75 ± 2% +0.1 0.87 mpstat.cpu.all.irq% 0.45 +0.7 1.11 ± 4% mpstat.cpu.all.soft% 76.23 -8.2 68.00 mpstat.cpu.all.sys% 1.52 +1.1 2.63 mpstat.cpu.all.usr% 15273 ± 39% +115.0% 32841 ± 6% perf-c2c.DRAM.local 11312 ± 42% +462.1% 63587 ± 11% perf-c2c.DRAM.remote 17041 ± 39% +521.2% 105868 ± 9% perf-c2c.HITM.local 5959 ± 41% +610.3% 42332 ± 11% perf-c2c.HITM.remote 23001 ± 40% +544.3% 148201 ± 9% perf-c2c.HITM.total 0.10 ± 9% +44.6% 0.15 turbostat.IPC 41291979 ± 9% +46.8% 60611834 turbostat.IRQ 262.50 ± 9% +16.0% 304.39 turbostat.PkgWatt 19.84 ± 5% +23.0% 24.39 turbostat.RAMWatt 0.02 +50.0% 0.03 turbostat.SysWatt 23.63 ± 2% +26.3% 29.83 vmstat.cpu.id 10289045 ± 2% +44.9% 14908391 ± 5% vmstat.memory.cache 781.86 ± 4% +13.9% 890.45 ± 6% vmstat.procs.r 760169 +123.8% 1700926 vmstat.system.cs 624448 ± 7% +46.3% 913594 vmstat.system.in 94.93 -94.9 0.00 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe 94.92 -94.9 0.00 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe 48.28 -48.3 0.00 perf-profile.calltrace.cycles-pp.__do_sys_clone3.do_syscall_64.entry_SYSCALL_64_after_hwframe 48.27 -48.3 0.00 perf-profile.calltrace.cycles-pp.kernel_clone.__do_sys_clone3.do_syscall_64.entry_SYSCALL_64_after_hwframe 46.51 -46.5 0.00 perf-profile.calltrace.cycles-pp.copy_process.kernel_clone.__do_sys_clone3.do_syscall_64.entry_SYSCALL_64_after_hwframe 44.15 -44.2 0.00 perf-profile.calltrace.cycles-pp.alloc_pid.copy_process.kernel_clone.__do_sys_clone3.do_syscall_64 44.00 -44.0 0.00 perf-profile.calltrace.cycles-pp.x64_sys_call.do_syscall_64.entry_SYSCALL_64_after_hwframe 44.00 -44.0 0.00 perf-profile.calltrace.cycles-pp.__x64_sys_exit.x64_sys_call.do_syscall_64.entry_SYSCALL_64_after_hwframe 44.00 -44.0 0.00 perf-profile.calltrace.cycles-pp.do_exit.__x64_sys_exit.x64_sys_call.do_syscall_64.entry_SYSCALL_64_after_hwframe 43.77 -43.8 0.00 perf-profile.calltrace.cycles-pp._raw_spin_lock.alloc_pid.copy_process.kernel_clone.__do_sys_clone3 43.74 -43.7 0.00 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.alloc_pid.copy_process.kernel_clone 42.86 -42.9 0.00 perf-profile.calltrace.cycles-pp.exit_notify.do_exit.__x64_sys_exit.x64_sys_call.do_syscall_64 42.71 -42.7 0.00 perf-profile.calltrace.cycles-pp.release_task.exit_notify.do_exit.__x64_sys_exit.x64_sys_call 42.36 -42.4 0.00 perf-profile.calltrace.cycles-pp.free_pids.release_task.exit_notify.do_exit.__x64_sys_exit 42.32 -42.3 0.00 perf-profile.calltrace.cycles-pp.free_pid.free_pids.release_task.exit_notify.do_exit 42.15 -42.2 0.00 perf-profile.calltrace.cycles-pp._raw_spin_lock.free_pid.free_pids.release_task.exit_notify 42.06 -42.1 0.00 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.free_pid.free_pids.release_task 96.27 -96.3 0.00 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 96.25 -96.2 0.00 perf-profile.children.cycles-pp.do_syscall_64 87.32 -87.3 0.00 perf-profile.children.cycles-pp._raw_spin_lock 87.27 -87.3 0.00 perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath 48.28 -48.3 0.00 perf-profile.children.cycles-pp.__do_sys_clone3 48.27 -48.3 0.00 perf-profile.children.cycles-pp.kernel_clone 46.51 -46.5 0.00 perf-profile.children.cycles-pp.copy_process 44.15 -44.2 0.00 perf-profile.children.cycles-pp.alloc_pid 44.01 -44.0 0.00 perf-profile.children.cycles-pp.x64_sys_call 44.00 -44.0 0.00 perf-profile.children.cycles-pp.__x64_sys_exit 44.00 -44.0 0.00 perf-profile.children.cycles-pp.do_exit 42.86 -42.9 0.00 perf-profile.children.cycles-pp.exit_notify 42.71 -42.7 0.00 perf-profile.children.cycles-pp.release_task 42.36 -42.4 0.00 perf-profile.children.cycles-pp.free_pids 42.32 -42.3 0.00 perf-profile.children.cycles-pp.free_pid 86.50 -86.5 0.00 perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath 3.91 +39.0% 5.44 perf-stat.i.MPKI 1.071e+10 +39.3% 1.491e+10 perf-stat.i.branch-instructions 0.55 +0.3 0.89 perf-stat.i.branch-miss-rate% 58562752 +125.4% 1.32e+08 ± 2% perf-stat.i.branch-misses 33.04 -1.1 31.91 perf-stat.i.cache-miss-rate% 1.846e+08 +103.4% 3.755e+08 perf-stat.i.cache-misses 5.592e+08 +110.8% 1.179e+09 perf-stat.i.cache-references 791816 +124.8% 1780366 perf-stat.i.context-switches 10.42 -34.7% 6.80 perf-stat.i.cpi 4.923e+11 -6.9% 4.584e+11 perf-stat.i.cpu-cycles 124149 +94.6% 241625 perf-stat.i.cpu-migrations 2676 -52.5% 1270 ± 2% perf-stat.i.cycles-between-cache-misses 4.769e+10 +45.8% 6.954e+10 perf-stat.i.instructions 0.10 +55.4% 0.15 perf-stat.i.ipc 10.82 +128.3% 24.70 perf-stat.i.metric.K/sec 584711 +110.0% 1228050 perf-stat.i.minor-faults 722714 +111.3% 1527264 perf-stat.i.page-faults 3.89 +39.3% 5.42 perf-stat.overall.MPKI 0.55 +0.3 0.89 perf-stat.overall.branch-miss-rate% 33.04 -1.2 31.87 perf-stat.overall.cache-miss-rate% 10.34 -36.2% 6.60 perf-stat.overall.cpi 2659 -54.2% 1217 ± 2% perf-stat.overall.cycles-between-cache-misses 0.10 +56.8% 0.15 perf-stat.overall.ipc 1.041e+10 +40.0% 1.458e+10 perf-stat.ps.branch-instructions 57180163 +126.3% 1.294e+08 ± 2% perf-stat.ps.branch-misses 1.804e+08 +104.2% 3.683e+08 perf-stat.ps.cache-misses 5.46e+08 +111.7% 1.156e+09 perf-stat.ps.cache-references 774516 +125.5% 1746770 perf-stat.ps.context-switches 4.797e+11 -6.5% 4.483e+11 perf-stat.ps.cpu-cycles 121274 +95.3% 236908 perf-stat.ps.cpu-migrations 4.639e+10 +46.5% 6.798e+10 perf-stat.ps.instructions 568315 +111.7% 1203024 perf-stat.ps.minor-faults 703458 +112.8% 1496627 perf-stat.ps.page-faults 2.724e+12 ± 9% +53.6% 4.184e+12 perf-stat.total.instructions 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. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki