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Wed, 29 Oct 2025 04:17:28 +0000 Date: Wed, 29 Oct 2025 12:17:14 +0800 From: kernel test robot To: Shubhang Kaushik via B4 Relay CC: , , , , , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Shubhang Kaushik , Shijie Huang , Frank Wang , Christopher Lameter , Adam Li , Shubhang Kaushik , Subject: Re: [PATCH] sched/fair: Prefer cache-hot prev_cpu for wakeup Message-ID: <202510291148.b2988254-lkp@intel.com> Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251017-b4-sched-cfs-refactor-propagate-v1-1-1eb0dc5b19b3@os.amperecomputing.com> X-ClientProxiedBy: KU2P306CA0072.MYSP306.PROD.OUTLOOK.COM (2603:1096:d10:3a::12) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|SA1PR11MB8839:EE_ X-MS-Office365-Filtering-Correlation-Id: 4d330573-06f5-40e0-eb3e-08de16a21232 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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FYI. kernel test robot noticed a 8.5% regression of stress-ng.io-uring.ops_per_sec on: commit: 24efd1bf8a44f0f51f42f4af4ce22f21e873073d ("[PATCH] sched/fair: Prefer cache-hot prev_cpu for wakeup") url: https://github.com/intel-lab-lkp/linux/commits/Shubhang-Kaushik-via-B4-Relay/sched-fair-Prefer-cache-hot-prev_cpu-for-wakeup/20251018-092110 patch link: https://lore.kernel.org/all/20251017-b4-sched-cfs-refactor-propagate-v1-1-1eb0dc5b19b3@os.amperecomputing.com/ patch subject: [PATCH] sched/fair: Prefer cache-hot prev_cpu for wakeup testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 256 threads 2 sockets Intel(R) Xeon(R) 6768P CPU @ 2.4GHz (Granite Rapids) with 64G 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/202510291148.b2988254-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251029/202510291148.b2988254-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-gnr-2sp4/io-uring/stress-ng/60s commit: 9b332cece9 ("Merge tag 'nfsd-6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux") 24efd1bf8a ("sched/fair: Prefer cache-hot prev_cpu for wakeup") 9b332cece987ee17 24efd1bf8a44f0f51f42f4af4ce ---------------- --------------------------- %stddev %change %stddev \ | \ 3.58e+09 +17.6% 4.21e+09 cpuidle..time 9.276e+08 -35.8% 5.958e+08 ± 2% cpuidle..usage 48009670 -12.7% 41899608 ± 4% numa-numastat.node0.local_node 48122238 -12.8% 41981276 ± 4% numa-numastat.node0.numa_hit 0.89 ± 44% +13.2 14.07 ± 3% turbostat.C1E% 0.67 ± 44% +381.0% 3.22 turbostat.CPU%c1 1.375e+08 ± 44% +199.4% 4.116e+08 turbostat.IRQ 4.70 ± 44% +224.5% 15.25 turbostat.RAMWatt 210.17 ± 77% +1158.0% 2643 perf-c2c.DRAM.local 1725 ± 11% +10694.5% 186276 ± 3% perf-c2c.DRAM.remote 320853 -50.4% 159203 ± 4% perf-c2c.HITM.local 1320 ± 13% +9462.5% 126256 ± 3% perf-c2c.HITM.remote 322174 -11.4% 285460 perf-c2c.HITM.total 14.00 ± 4% -2.1 11.92 ± 4% mpstat.cpu.all.idle% 13.31 +5.2 18.56 mpstat.cpu.all.iowait% 1.48 +4.9 6.39 ± 3% mpstat.cpu.all.irq% 0.85 -0.2 0.68 mpstat.cpu.all.soft% 3.51 -2.1 1.40 ± 5% mpstat.cpu.all.usr% 18.17 ± 4% +12.8% 20.50 ± 4% mpstat.max_utilization.seconds 12518136 -40.6% 7432802 ± 5% meminfo.Active 12518120 -40.6% 7432786 ± 5% meminfo.Active(anon) 14791509 -34.2% 9726112 ± 4% meminfo.Cached 17016588 -29.8% 11943542 ± 3% meminfo.Committed_AS 19860760 -19.5% 15994452 ± 2% meminfo.Memused 11109813 -45.8% 6019207 ± 6% meminfo.Shmem 19916177 -19.5% 16031079 ± 2% meminfo.max_used_kB 104776 ± 14% -24.3% 79337 ± 21% numa-meminfo.node0.KReclaimable 104776 ± 14% -24.3% 79337 ± 21% numa-meminfo.node0.SReclaimable 11913809 -42.7% 6821430 ± 5% numa-meminfo.node1.Active 11913804 -42.7% 6821421 ± 5% numa-meminfo.node1.Active(anon) 11336225 ± 2% -30.4% 7891392 ± 23% numa-meminfo.node1.FilePages 19000428 +14.7% 21787417 ± 8% numa-meminfo.node1.MemFree 11104229 -45.9% 6012466 ± 6% numa-meminfo.node1.Shmem 1.125e+09 -8.4% 1.03e+09 ± 3% stress-ng.io-uring.ops 18779554 -8.5% 17185210 ± 3% stress-ng.io-uring.ops_per_sec 2.353e+08 +58.7% 3.735e+08 ± 3% stress-ng.time.involuntary_context_switches 16880 -11.1% 15008 stress-ng.time.percent_of_cpu_this_job_got 9702 -8.5% 8878 stress-ng.time.system_time 443.21 -67.8% 142.54 ± 2% stress-ng.time.user_time 1.362e+09 -11.5% 1.206e+09 ± 3% stress-ng.time.voluntary_context_switches 26194 ± 14% -24.3% 19834 ± 21% numa-vmstat.node0.nr_slab_reclaimable 48122182 -12.8% 41981349 ± 4% numa-vmstat.node0.numa_hit 48009614 -12.7% 41899680 ± 4% numa-vmstat.node0.numa_local 2981009 -42.7% 1707865 ± 5% numa-vmstat.node1.nr_active_anon 2836469 ± 2% -30.4% 1975086 ± 23% numa-vmstat.node1.nr_file_pages 4747481 +14.7% 5444494 ± 8% numa-vmstat.node1.nr_free_pages 4714110 +14.8% 5411734 ± 8% numa-vmstat.node1.nr_free_pages_blocks 2778450 -45.8% 1505400 ± 6% numa-vmstat.node1.nr_shmem 2981003 -42.7% 1707858 ± 5% numa-vmstat.node1.nr_zone_active_anon 3131938 -40.6% 1860663 ± 5% proc-vmstat.nr_active_anon 1133648 +8.5% 1230219 proc-vmstat.nr_dirty_background_threshold 2270069 +8.5% 2463447 proc-vmstat.nr_dirty_threshold 3700155 -34.2% 2433658 ± 4% proc-vmstat.nr_file_pages 11441308 +8.5% 12408439 proc-vmstat.nr_free_pages 11335855 +8.6% 12314183 proc-vmstat.nr_free_pages_blocks 2779743 -45.8% 1507064 ± 6% proc-vmstat.nr_shmem 50620 -5.9% 47611 proc-vmstat.nr_slab_reclaimable 3131938 -40.6% 1860663 ± 5% proc-vmstat.nr_zone_active_anon 99148879 -9.8% 89432077 ± 3% proc-vmstat.numa_hit 98893495 -9.8% 89168637 ± 3% proc-vmstat.numa_local 54203 ± 24% -57.3% 23128 ± 10% proc-vmstat.numa_pages_migrated 99397243 -9.8% 89638031 ± 3% proc-vmstat.pgalloc_normal 94583491 -8.4% 86624034 ± 3% proc-vmstat.pgfree 54203 ± 24% -57.3% 23128 ± 10% proc-vmstat.pgmigrate_success 39031 +1.8% 39717 proc-vmstat.pgreuse 47196381 -31.6% 32305642 ± 2% proc-vmstat.unevictable_pgs_culled 0.08 ± 2% +3468.8% 2.97 ± 4% perf-stat.i.MPKI 7.499e+10 -21.9% 5.854e+10 ± 2% perf-stat.i.branch-instructions 0.94 -0.3 0.62 perf-stat.i.branch-miss-rate% 6.557e+08 -48.5% 3.38e+08 ± 2% perf-stat.i.branch-misses 0.70 ± 2% +36.7 37.40 ± 4% perf-stat.i.cache-miss-rate% 29724413 ± 2% +2544.3% 7.86e+08 perf-stat.i.cache-misses 5.32e+09 -60.5% 2.103e+09 ± 3% perf-stat.i.cache-references 42032996 -14.0% 36140436 ± 2% perf-stat.i.context-switches 2.29 +18.0% 2.70 ± 2% perf-stat.i.cpi 7.916e+11 -9.6% 7.154e+11 perf-stat.i.cpu-cycles 11062415 -99.9% 15481 perf-stat.i.cpu-migrations 44096 ± 5% -97.9% 910.19 perf-stat.i.cycles-between-cache-misses 3.698e+11 -22.9% 2.852e+11 ± 2% perf-stat.i.instructions 0.46 -14.9% 0.40 ± 2% perf-stat.i.ipc 0.05 ± 47% +96.1% 0.09 ± 14% perf-stat.i.major-faults 207.41 -31.9% 141.15 ± 2% perf-stat.i.metric.K/sec 0.08 ± 2% +3331.9% 2.76 ± 4% perf-stat.overall.MPKI 0.87 -0.3 0.58 perf-stat.overall.branch-miss-rate% 0.56 ± 2% +36.9 37.43 ± 4% perf-stat.overall.cache-miss-rate% 2.14 +17.3% 2.51 ± 2% perf-stat.overall.cpi 26647 ± 2% -96.6% 910.56 perf-stat.overall.cycles-between-cache-misses 0.47 -14.7% 0.40 ± 2% perf-stat.overall.ipc 7.375e+10 -21.9% 5.757e+10 ± 2% perf-stat.ps.branch-instructions 6.449e+08 -48.4% 3.325e+08 ± 2% perf-stat.ps.branch-misses 29243806 ± 2% +2543.5% 7.731e+08 perf-stat.ps.cache-misses 5.233e+09 -60.5% 2.068e+09 ± 3% perf-stat.ps.cache-references 41341425 -14.0% 35549572 ± 2% perf-stat.ps.context-switches 7.786e+11 -9.6% 7.037e+11 perf-stat.ps.cpu-cycles 10881167 -99.9% 15227 perf-stat.ps.cpu-migrations 3.637e+11 -22.9% 2.805e+11 ± 2% perf-stat.ps.instructions 0.05 ± 47% +93.6% 0.09 ± 14% perf-stat.ps.major-faults 2.217e+13 -22.7% 1.713e+13 ± 2% perf-stat.total.instructions 4219859 -17.8% 3469357 sched_debug.cfs_rq:/.avg_vruntime.avg 7247589 ± 9% -38.3% 4469027 ± 7% sched_debug.cfs_rq:/.avg_vruntime.max 4013259 -29.0% 2849620 ± 17% sched_debug.cfs_rq:/.avg_vruntime.min 265810 ± 14% -54.9% 119970 ± 11% sched_debug.cfs_rq:/.avg_vruntime.stddev 3.42 ± 10% -24.4% 2.58 ± 7% sched_debug.cfs_rq:/.h_nr_queued.max 3.33 ± 11% -22.5% 2.58 ± 7% sched_debug.cfs_rq:/.h_nr_runnable.max 4401036 -17.1% 3647494 ± 4% sched_debug.cfs_rq:/.left_deadline.max 1274751 ± 5% -18.7% 1035958 ± 12% sched_debug.cfs_rq:/.left_deadline.stddev 4400687 -17.1% 3647059 ± 4% sched_debug.cfs_rq:/.left_vruntime.max 1274640 ± 5% -18.7% 1035848 ± 12% sched_debug.cfs_rq:/.left_vruntime.stddev 4219859 -17.8% 3469357 sched_debug.cfs_rq:/.min_vruntime.avg 7247589 ± 9% -38.3% 4469027 ± 7% sched_debug.cfs_rq:/.min_vruntime.max 4013259 -29.0% 2849620 ± 17% sched_debug.cfs_rq:/.min_vruntime.min 265810 ± 14% -54.9% 119970 ± 11% sched_debug.cfs_rq:/.min_vruntime.stddev 4400687 -17.1% 3647059 ± 4% sched_debug.cfs_rq:/.right_vruntime.max 1274640 ± 5% -18.7% 1035848 ± 12% sched_debug.cfs_rq:/.right_vruntime.stddev 532.33 -11.4% 471.62 ± 2% sched_debug.cfs_rq:/.runnable_avg.avg 1361 ± 3% +18.4% 1611 ± 10% sched_debug.cfs_rq:/.runnable_avg.max 203.24 ± 4% +38.0% 280.47 ± 3% sched_debug.cfs_rq:/.runnable_avg.stddev 108.79 ± 5% +68.6% 183.41 ± 4% sched_debug.cfs_rq:/.util_avg.stddev 99.93 ± 8% +144.8% 244.58 ± 4% sched_debug.cfs_rq:/.util_est.avg 154.15 ± 10% +41.9% 218.69 ± 5% sched_debug.cfs_rq:/.util_est.stddev 585777 ± 3% +55.0% 907718 ± 6% sched_debug.cpu.avg_idle.avg 257569 ± 15% +30.0% 334947 ± 11% sched_debug.cpu.avg_idle.stddev 581651 ± 2% +97.0% 1146052 ± 3% sched_debug.cpu.max_idle_balance_cost.avg 1334820 ± 4% +10.9% 1479741 sched_debug.cpu.max_idle_balance_cost.max 150290 ± 9% +34.9% 202732 ± 7% sched_debug.cpu.max_idle_balance_cost.stddev 3.42 ± 10% -24.4% 2.58 ± 13% sched_debug.cpu.nr_running.max 4900954 -14.0% 4212806 ± 2% sched_debug.cpu.nr_switches.avg 1872618 ± 12% +57.1% 2941530 ± 17% sched_debug.cpu.nr_switches.min -24.25 -67.7% -7.83 sched_debug.cpu.nr_uninterruptible.min 8.41 ± 12% -46.3% 4.52 ± 14% sched_debug.cpu.nr_uninterruptible.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