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X-MS-Exchange-CrossTenant-UserPrincipalName: /6dNp/NEviD5yBSnTj/K33ni+f0ez3XtQq4B9CwSYE1uV8UfROTEYeqXX28D58dJm896rtSV+h7EQZ2fKemIMw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR11MB6653 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 41.9% regression of stress-ng.io-uring.ops_per_sec on: commit: 61a5e202971d4a242fc761728e89922edde02d38 ("io_uring: switch defer task_work to using a ring") https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git io_uring-defer-tw.4 testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-12 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: io-uring cpufreq_governor: performance If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202507010550.2d6f83ea-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250701/202507010550.2d6f83ea-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-srf-2sp2/io-uring/stress-ng/60s commit: 8559f3b41f ("io_uring: make task_work pending check dependent on ring type") 61a5e20297 ("io_uring: switch defer task_work to using a ring") 8559f3b41fdcdd01 61a5e202971d4a242fc761728e8 ---------------- --------------------------- %stddev %change %stddev \ | \ 1022268 ± 2% -30.4% 711175 meminfo.Mapped 7.478e+09 +30.1% 9.727e+09 cpuidle..time 3.03e+08 -20.9% 2.398e+08 ± 3% cpuidle..usage 696425 ±171% +181.2% 1958387 ± 81% numa-meminfo.node0.Unevictable 940879 ± 10% -32.9% 631792 ± 14% numa-meminfo.node1.Mapped 43.50 ± 20% -73.9% 11.33 ± 53% perf-c2c.DRAM.local 32749 ± 10% -86.3% 4475 ± 29% perf-c2c.HITM.local 33251 ± 10% -85.0% 4989 ± 25% perf-c2c.HITM.total 14632245 ± 9% -38.5% 8999074 ± 7% numa-numastat.node0.local_node 14749610 ± 9% -38.6% 9056826 ± 6% numa-numastat.node0.numa_hit 21106190 ± 4% -37.5% 13198942 ± 4% numa-numastat.node1.local_node 21186924 ± 4% -37.0% 13339356 ± 4% numa-numastat.node1.numa_hit 43.02 ± 2% -12.5% 37.66 ± 2% vmstat.cpu.id 19.87 +121.8% 44.07 ± 2% vmstat.cpu.wa 73.14 +101.7% 147.54 ± 2% vmstat.procs.b 112.33 ± 2% -64.8% 39.60 ± 7% vmstat.procs.r 12695197 -38.2% 7849636 ± 4% vmstat.system.cs 5179340 ± 2% -24.4% 3915343 ± 4% vmstat.system.in 174059 ±171% +181.3% 489607 ± 81% numa-vmstat.node0.nr_unevictable 174060 ±171% +181.3% 489607 ± 81% numa-vmstat.node0.nr_zone_unevictable 14750003 ± 9% -38.6% 9057006 ± 6% numa-vmstat.node0.numa_hit 14632638 ± 9% -38.5% 8999253 ± 7% numa-vmstat.node0.numa_local 236391 ± 10% -33.3% 157713 ± 14% numa-vmstat.node1.nr_mapped 21186186 ± 4% -37.0% 13338387 ± 4% numa-vmstat.node1.numa_hit 21105453 ± 4% -37.5% 13197958 ± 4% numa-vmstat.node1.numa_local 41.57 -5.8 35.76 ± 2% mpstat.cpu.all.idle% 20.32 +25.1 45.43 ± 2% mpstat.cpu.all.iowait% 6.25 ± 4% -2.2 4.09 ± 6% mpstat.cpu.all.irq% 0.34 ± 4% -0.2 0.14 ± 6% mpstat.cpu.all.soft% 28.91 -15.5 13.40 ± 6% mpstat.cpu.all.sys% 2.62 -1.4 1.17 ± 6% mpstat.cpu.all.usr% 18.83 ± 5% -84.1% 3.00 mpstat.max_utilization.seconds 61.41 -30.1% 42.94 mpstat.max_utilization_pct 3.455e+08 -41.9% 2.006e+08 ± 4% stress-ng.io-uring.ops 5758736 -41.9% 3343243 ± 4% stress-ng.io-uring.ops_per_sec 63485668 -85.7% 9052788 ± 15% stress-ng.time.involuntary_context_switches 86971 -2.2% 85030 stress-ng.time.minor_page_faults 6021 -54.8% 2724 ± 6% stress-ng.time.percent_of_cpu_this_job_got 3383 -53.8% 1562 ± 6% stress-ng.time.system_time 248.17 -67.3% 81.18 ± 9% stress-ng.time.user_time 4.227e+08 -40.1% 2.531e+08 ± 4% stress-ng.time.voluntary_context_switches 2888857 ± 2% -8.1% 2654260 proc-vmstat.nr_active_anon 302955 -3.1% 293576 proc-vmstat.nr_anon_pages 3475920 ± 2% -6.5% 3250878 proc-vmstat.nr_file_pages 44207 -3.1% 42858 proc-vmstat.nr_kernel_stack 255933 ± 3% -30.6% 177546 proc-vmstat.nr_mapped 2586684 ± 3% -8.7% 2361525 proc-vmstat.nr_shmem 43152 -1.5% 42518 proc-vmstat.nr_slab_reclaimable 2888857 ± 2% -8.1% 2654260 proc-vmstat.nr_zone_active_anon 35939101 -37.7% 22399100 ± 3% proc-vmstat.numa_hit 35741003 -37.9% 22200912 ± 3% proc-vmstat.numa_local 585759 ± 5% -27.5% 424436 ± 8% proc-vmstat.numa_pte_updates 36196152 -37.5% 22624491 ± 3% proc-vmstat.pgalloc_normal 700860 ± 3% -7.0% 651538 ± 4% proc-vmstat.pgfault 32134448 -41.1% 18939637 ± 4% proc-vmstat.pgfree 16707904 -77.5% 3755057 ± 10% proc-vmstat.unevictable_pgs_culled 0.17 ± 4% +94.3% 0.32 ± 16% perf-stat.i.MPKI 2.698e+10 -40.1% 1.616e+10 ± 4% perf-stat.i.branch-instructions 0.92 -0.3 0.64 perf-stat.i.branch-miss-rate% 2.173e+08 -57.1% 93142321 ± 5% perf-stat.i.branch-misses 2.25 ± 4% +6.4 8.67 ± 17% perf-stat.i.cache-miss-rate% 1.262e+09 -68.8% 3.94e+08 ± 6% perf-stat.i.cache-references 13218006 -37.6% 8252620 ± 4% perf-stat.i.context-switches 3.40 -7.5% 3.15 ± 3% perf-stat.i.cpi 4.003e+11 -40.4% 2.384e+11 ± 5% perf-stat.i.cpu-cycles 5382764 -76.2% 1281759 ± 10% perf-stat.i.cpu-migrations 32980 ± 5% -25.9% 24437 ± 9% perf-stat.i.cycles-between-cache-misses 1.327e+11 -39.9% 7.973e+10 ± 4% perf-stat.i.instructions 0.33 +9.9% 0.36 ± 3% perf-stat.i.ipc 96.88 -48.8% 49.64 ± 4% perf-stat.i.metric.K/sec 8872 ± 4% -11.6% 7844 ± 4% perf-stat.i.minor-faults 8872 ± 4% -11.6% 7844 ± 4% perf-stat.i.page-faults 0.18 ± 3% +61.7% 0.29 ± 8% perf-stat.overall.MPKI 0.81 -0.2 0.58 perf-stat.overall.branch-miss-rate% 1.88 ± 3% +4.0 5.86 ± 9% perf-stat.overall.cache-miss-rate% 16903 ± 3% -38.3% 10426 ± 9% perf-stat.overall.cycles-between-cache-misses 2.655e+10 -40.1% 1.59e+10 ± 4% perf-stat.ps.branch-instructions 2.138e+08 -57.2% 91585587 ± 5% perf-stat.ps.branch-misses 1.241e+09 -68.8% 3.875e+08 ± 6% perf-stat.ps.cache-references 13003285 -37.6% 8120099 ± 4% perf-stat.ps.context-switches 3.938e+11 -40.5% 2.345e+11 ± 5% perf-stat.ps.cpu-cycles 5295095 -76.2% 1259803 ± 10% perf-stat.ps.cpu-migrations 1.306e+11 -39.9% 7.846e+10 ± 4% perf-stat.ps.instructions 8714 ± 4% -11.7% 7694 ± 4% perf-stat.ps.minor-faults 8714 ± 4% -11.7% 7694 ± 4% perf-stat.ps.page-faults 8.049e+12 -40.0% 4.829e+12 ± 4% perf-stat.total.instructions 879267 ± 3% -77.4% 198767 ± 46% sched_debug.cfs_rq:/.avg_vruntime.avg 2197261 ± 7% -80.3% 433455 ± 40% sched_debug.cfs_rq:/.avg_vruntime.max 702597 ± 3% -82.0% 126663 ± 48% sched_debug.cfs_rq:/.avg_vruntime.min 144651 ± 9% -75.7% 35081 ± 36% sched_debug.cfs_rq:/.avg_vruntime.stddev 0.38 ± 7% -79.6% 0.08 ± 20% sched_debug.cfs_rq:/.h_nr_queued.avg 2.92 ± 20% -65.7% 1.00 sched_debug.cfs_rq:/.h_nr_queued.max 0.61 ± 4% -57.2% 0.26 ± 9% sched_debug.cfs_rq:/.h_nr_queued.stddev 0.34 ± 6% -77.5% 0.08 ± 19% sched_debug.cfs_rq:/.h_nr_runnable.avg 2.92 ± 20% -65.7% 1.00 sched_debug.cfs_rq:/.h_nr_runnable.max 0.56 ± 5% -53.3% 0.26 ± 9% sched_debug.cfs_rq:/.h_nr_runnable.stddev 115895 ± 14% -93.3% 7740 ± 69% sched_debug.cfs_rq:/.left_deadline.avg 1148129 ± 31% -77.7% 255916 ± 52% sched_debug.cfs_rq:/.left_deadline.max 300169 ± 8% -87.0% 39025 ± 54% sched_debug.cfs_rq:/.left_deadline.stddev 115876 ± 14% -93.3% 7740 ± 69% sched_debug.cfs_rq:/.left_vruntime.avg 1147975 ± 31% -77.7% 255883 ± 52% sched_debug.cfs_rq:/.left_vruntime.max 300120 ± 8% -87.0% 39021 ± 54% sched_debug.cfs_rq:/.left_vruntime.stddev 2.08 ± 16% -100.0% 0.00 sched_debug.cfs_rq:/.load_avg.min 879267 ± 3% -77.4% 198767 ± 46% sched_debug.cfs_rq:/.min_vruntime.avg 2197261 ± 7% -80.3% 433455 ± 40% sched_debug.cfs_rq:/.min_vruntime.max 702597 ± 3% -82.0% 126663 ± 48% sched_debug.cfs_rq:/.min_vruntime.min 144651 ± 9% -75.7% 35081 ± 36% sched_debug.cfs_rq:/.min_vruntime.stddev 0.24 ± 5% -67.9% 0.08 ± 19% sched_debug.cfs_rq:/.nr_queued.avg 0.36 -27.4% 0.26 ± 9% sched_debug.cfs_rq:/.nr_queued.stddev 115876 ± 14% -93.3% 7740 ± 69% sched_debug.cfs_rq:/.right_vruntime.avg 1147975 ± 31% -77.7% 255883 ± 52% sched_debug.cfs_rq:/.right_vruntime.max 300120 ± 8% -87.0% 39021 ± 54% sched_debug.cfs_rq:/.right_vruntime.stddev 293.31 ± 2% -61.0% 114.35 ± 10% sched_debug.cfs_rq:/.runnable_avg.avg 114.75 ± 6% -100.0% 0.00 sched_debug.cfs_rq:/.runnable_avg.min 161.40 ± 3% +16.8% 188.44 ± 6% sched_debug.cfs_rq:/.runnable_avg.stddev 243.06 ± 2% -53.0% 114.20 ± 10% sched_debug.cfs_rq:/.util_avg.avg 111.42 ± 5% -100.0% 0.00 sched_debug.cfs_rq:/.util_avg.min 143.53 ± 4% +31.2% 188.36 ± 6% sched_debug.cfs_rq:/.util_avg.stddev 45.14 ± 5% -53.8% 20.87 ± 29% sched_debug.cfs_rq:/.util_est.avg 117.16 ± 9% -23.3% 89.81 ± 15% sched_debug.cfs_rq:/.util_est.stddev 460889 +78.9% 824600 ± 4% sched_debug.cpu.avg_idle.avg 545161 ± 4% +83.4% 1000000 sched_debug.cpu.avg_idle.max 7815 ± 7% -47.7% 4084 ± 14% sched_debug.cpu.avg_idle.min 96234 ± 8% +192.4% 281404 ± 13% sched_debug.cpu.avg_idle.stddev 754.64 ± 5% -19.2% 609.61 ± 9% sched_debug.cpu.clock_task.stddev 1016 ± 7% -74.3% 261.72 ± 25% sched_debug.cpu.curr->pid.avg 1648 -37.6% 1027 ± 14% sched_debug.cpu.curr->pid.stddev 0.00 ± 24% -27.7% 0.00 ± 10% sched_debug.cpu.next_balance.stddev 0.35 ± 10% -82.5% 0.06 ± 20% sched_debug.cpu.nr_running.avg 2.92 ± 20% -65.7% 1.00 sched_debug.cpu.nr_running.max 0.60 ± 6% -61.0% 0.23 ± 8% sched_debug.cpu.nr_running.stddev 2060126 -47.9% 1073009 ± 44% sched_debug.cpu.nr_switches.avg 2688437 -31.6% 1839609 ± 44% sched_debug.cpu.nr_switches.max 650892 ± 9% -43.0% 370926 ± 54% sched_debug.cpu.nr_switches.min 522908 ± 2% -49.9% 261974 ± 45% sched_debug.cpu.nr_switches.stddev 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