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https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 192 threads 2 sockets Intel(R) Xeon(R) Platinum 8468V CPU @ 2.4GHz (Sapphire Rapids) with 384G memory parameters: nr_threads: 100% testtime: 60s test: forkheavy cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250331/202503311656.e3596aaf-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/igk-spr-2sp1/forkheavy/stress-ng/60s commit: b2ae5fccb8 ("mm: introduce vma_start_read_locked{_nested} helpers") 7b6218ae12 ("mm: move per-vma lock into vm_area_struct") b2ae5fccb8c0ec21 7b6218ae1253491d56f21f4b1f3 ---------------- --------------------------- %stddev %change %stddev \ | \ 382800 ± 4% +10.2% 421797 ± 5% numa-meminfo.node1.AnonHugePages 32850 +5.0% 34492 stress-ng.forkheavy.ops 493.66 +5.0% 518.50 stress-ng.forkheavy.ops_per_sec 40.74 ± 30% +68.2% 68.53 ± 23% sched_debug.cfs_rq:/.removed.runnable_avg.stddev 73.19 ± 42% +52.2% 111.39 ± 16% sched_debug.cfs_rq:/.util_est.avg 222.12 ± 29% +34.4% 298.62 ± 10% sched_debug.cfs_rq:/.util_est.stddev 4555 ± 10% -45.3% 2491 ± 27% perf-c2c.DRAM.local 11750 ± 4% -22.7% 9082 ± 22% perf-c2c.HITM.local 2592 ± 6% -45.4% 1414 ± 23% perf-c2c.HITM.remote 14342 ± 4% -26.8% 10497 ± 22% perf-c2c.HITM.total 41336771 -4.4% 39526485 proc-vmstat.numa_hit 41134683 -4.4% 39326465 proc-vmstat.numa_local 71479761 +1.8% 72742225 proc-vmstat.pgalloc_normal 3480841 +2.4% 3564757 proc-vmstat.pgfault 71044889 +1.7% 72274310 proc-vmstat.pgfree 1.47 ± 86% -73.5% 0.39 ±138% perf-sched.sch_delay.avg.ms.__cond_resched.do_ftruncate.do_sys_ftruncate.do_syscall_64.entry_SYSCALL_64_after_hwframe 0.33 ±108% +205.7% 1.00 ± 83% perf-sched.sch_delay.avg.ms.__cond_resched.down_write.do_mq_open.__x64_sys_mq_open.do_syscall_64 0.77 ± 25% +43.6% 1.10 ± 21% perf-sched.sch_delay.avg.ms.__cond_resched.dput.vfs_tmpfile.path_openat.do_filp_open 0.16 ± 17% +44.7% 0.23 ± 26% perf-sched.sch_delay.avg.ms.do_wait.kernel_wait4.do_syscall_64.entry_SYSCALL_64_after_hwframe 0.58 ± 85% -85.8% 0.08 ±130% perf-sched.sch_delay.avg.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown] 3.92 ± 72% -80.6% 0.76 ±198% perf-sched.sch_delay.max.ms.irqentry_exit_to_user_mode.asm_sysvec_reschedule_ipi.[unknown] 6.96 ± 55% +113.7% 14.88 ± 28% perf-sched.sch_delay.max.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 62.68 ± 72% +129.9% 144.11 ± 9% perf-sched.wait_and_delay.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 334.97 ± 57% -66.4% 112.42 ± 70% perf-sched.wait_and_delay.avg.ms.do_nanosleep.hrtimer_nanosleep.common_nsleep.__x64_sys_clock_nanosleep 82.80 ± 23% +73.9% 143.96 ± 9% perf-sched.wait_time.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 2.15 ± 43% -72.2% 0.60 ± 94% perf-sched.wait_time.avg.ms.__cond_resched.unmap_vmas.unmap_region.__mmap_new_vma.__mmap_region 68.44 ±135% +288.8% 266.12 ±121% perf-sched.wait_time.max.ms.__cond_resched.ww_mutex_lock.drm_gem_vunmap_unlocked.drm_gem_fb_vunmap.drm_atomic_helper_commit_planes 15.31 +8.9% 16.67 ± 2% perf-stat.i.MPKI 1.684e+10 -3.9% 1.618e+10 perf-stat.i.branch-instructions 75533943 -4.7% 72015903 perf-stat.i.branch-misses 6.71 +5.6% 7.09 perf-stat.i.cpi 8.19e+10 -5.7% 7.726e+10 perf-stat.i.instructions 0.16 -4.9% 0.15 perf-stat.i.ipc 16.72 +7.0% 17.90 perf-stat.overall.MPKI 6.53 +6.2% 6.94 perf-stat.overall.cpi 0.15 -5.9% 0.14 perf-stat.overall.ipc 1.66e+10 -4.2% 1.59e+10 perf-stat.ps.branch-instructions 73765712 -5.4% 69811938 perf-stat.ps.branch-misses 8.092e+10 -5.9% 7.612e+10 perf-stat.ps.instructions 5.53e+12 -5.5% 5.227e+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