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X-MS-Exchange-CrossTenant-UserPrincipalName: Axrq8q4L12OeGS1yf/XeTzAtweVG8/c6CMhfzp9GtgwByVVW+xxuWiZR9rxh6ksKoZGNj169FTSu/nydSzYcPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR11MB6927 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 7.5% improvement of stress-ng.set.ops_per_sec on: commit: b4dc0bee2a749083028afba346910e198653f42a ("ucount: use rcuref_t for reference counting") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory parameters: nr_threads: 100% testtime: 60s test: set cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250422/202504221604.38512645-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/lkp-spr-r02/set/stress-ng/60s commit: 5f01a22c5b ("ucount: use RCU for ucounts lookups") b4dc0bee2a ("ucount: use rcuref_t for reference counting") 5f01a22c5b231dd5 b4dc0bee2a749083028afba3469 ---------------- --------------------------- %stddev %change %stddev \ | \ 10.78 -1.6 9.22 mpstat.cpu.all.soft% 150.17 ± 5% -54.4% 68.50 ± 11% perf-c2c.DRAM.local 14.70 ± 13% -18.0% 12.05 ± 8% vmstat.procs.r 235759 +7.0% 252328 vmstat.system.cs 229993 -1.6% 226301 vmstat.system.in 1456 ± 3% -40.2% 870.70 ± 59% sched_debug.cfs_rq:/.avg_vruntime.min 56228 ±133% -81.2% 10577 ± 72% sched_debug.cfs_rq:/.load.avg 605295 ±186% -89.2% 65458 ± 51% sched_debug.cfs_rq:/.load.stddev 1456 ± 3% -40.2% 870.70 ± 59% sched_debug.cfs_rq:/.min_vruntime.min 259.95 ± 14% -33.5% 172.79 ± 21% sched_debug.cpu.curr->pid.avg 1122 ± 7% -22.0% 874.99 ± 15% sched_debug.cpu.curr->pid.stddev 7692146 +7.5% 8265701 stress-ng.set.ops 128199 +7.5% 137758 stress-ng.set.ops_per_sec 28263 ± 2% -34.1% 18622 ± 2% stress-ng.time.involuntary_context_switches 77524 -1.7% 76216 stress-ng.time.minor_page_faults 750.50 -3.0% 728.33 stress-ng.time.percent_of_cpu_this_job_got 416.18 -3.8% 400.28 stress-ng.time.system_time 7083512 +8.2% 7667679 stress-ng.time.voluntary_context_switches 141813 +4.2% 147721 proc-vmstat.nr_shmem 1695593 +2.9% 1745184 proc-vmstat.numa_hit 1462962 +3.4% 1512676 proc-vmstat.numa_local 99906 ± 9% -23.1% 76793 ± 17% proc-vmstat.numa_pages_migrated 321573 ± 14% -32.0% 218744 ± 22% proc-vmstat.numa_pte_updates 2547220 +3.5% 2636020 proc-vmstat.pgalloc_normal 2441293 +3.4% 2524816 proc-vmstat.pgfree 99906 ± 9% -23.1% 76793 ± 17% proc-vmstat.pgmigrate_success 0.19 ±143% -96.6% 0.01 ± 49% perf-sched.sch_delay.avg.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown].[unknown] 0.32 ±133% -72.7% 0.09 ± 16% perf-sched.sch_delay.avg.ms.worker_thread.kthread.ret_from_fork.ret_from_fork_asm 0.39 ±135% -98.1% 0.01 ± 52% perf-sched.sch_delay.max.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown].[unknown] 240.34 ±217% -98.5% 3.55 ± 6% perf-sched.sch_delay.max.ms.worker_thread.kthread.ret_from_fork.ret_from_fork_asm 0.02 ± 8% -19.4% 0.01 ± 8% perf-sched.total_sch_delay.average.ms 3.02 -9.3% 2.74 perf-sched.wait_and_delay.avg.ms.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.__do_sys_newuname 114.29 ± 2% +18.6% 135.51 ± 2% perf-sched.wait_and_delay.avg.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 128.00 ± 4% +14.1% 146.00 perf-sched.wait_and_delay.count.schedule_hrtimeout_range.do_poll.constprop.0.do_sys_poll 18816 ± 2% -16.6% 15697 ± 2% perf-sched.wait_and_delay.count.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 99.29 ±187% -98.1% 1.85 ±117% perf-sched.wait_time.avg.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown].[unknown] 3.01 -9.3% 2.73 perf-sched.wait_time.avg.ms.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.__do_sys_newuname 114.18 ± 2% +18.6% 135.41 ± 2% perf-sched.wait_time.avg.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 195.32 ±189% -98.6% 2.64 ±124% perf-sched.wait_time.max.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown].[unknown] 2.37 -1.8% 2.33 perf-stat.i.MPKI 2.841e+09 +3.2% 2.932e+09 perf-stat.i.branch-instructions 1.47 -0.1 1.40 perf-stat.i.branch-miss-rate% 26.62 +1.0 27.64 perf-stat.i.cache-miss-rate% 1.193e+08 -2.5% 1.163e+08 perf-stat.i.cache-references 243399 +7.3% 261109 perf-stat.i.context-switches 7.74 -13.1% 6.73 perf-stat.i.cpi 1.006e+11 -10.6% 8.988e+10 perf-stat.i.cpu-cycles 4164 -7.0% 3871 perf-stat.i.cpu-migrations 3253 -11.7% 2872 perf-stat.i.cycles-between-cache-misses 1.378e+10 +3.1% 1.421e+10 perf-stat.i.instructions 0.15 +15.3% 0.17 perf-stat.i.ipc 1.03 +10.3% 1.13 perf-stat.i.metric.K/sec 2.29 -1.9% 2.25 perf-stat.overall.MPKI 1.65 -0.1 1.58 perf-stat.overall.branch-miss-rate% 26.43 +1.0 27.43 perf-stat.overall.cache-miss-rate% 7.30 -13.3% 6.33 perf-stat.overall.cpi 3189 -11.6% 2818 perf-stat.overall.cycles-between-cache-misses 0.14 +15.4% 0.16 perf-stat.overall.ipc 2.794e+09 +3.2% 2.883e+09 perf-stat.ps.branch-instructions 1.174e+08 -2.6% 1.144e+08 perf-stat.ps.cache-references 239347 +7.3% 256763 perf-stat.ps.context-switches 9.894e+10 -10.6% 8.843e+10 perf-stat.ps.cpu-cycles 4096 -7.0% 3808 perf-stat.ps.cpu-migrations 1.355e+10 +3.1% 1.398e+10 perf-stat.ps.instructions 8.25e+11 +3.2% 8.511e+11 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