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X-MS-Exchange-CrossTenant-UserPrincipalName: tpWLkvWGpmO5d1XG7pw7BmOGjNXKz5jIG68E8B5hz/OieyPc7dO8AnkbiprQjh47zh5wdUTXT+4u7XonOVYaOw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR11MB6085 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 3.9% regression of perf-bench-futex.ops/s on: commit: b04b8f3032aae6121303bfa324c768faba032242 ("futex: Introduce futex_q_lockptr_lock()") https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git locking/futex [test failed on linux-next/master 484803582c77061b470ac64a634f25f89715be3f] testcase: perf-bench-futex 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: runtime: 300s nr_task: 100% test: hash shared: shared 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/202505191048.c1220460-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250519/202505191048.c1220460-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_task/rootfs/runtime/shared/tbox_group/test/testcase: gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/300s/shared/lkp-srf-2sp2/hash/perf-bench-futex commit: fe00e88d21 ("futex: Decrease the waiter count before the unlock operation") b04b8f3032 ("futex: Introduce futex_q_lockptr_lock()") fe00e88d217a7bf7 b04b8f3032aae6121303bfa324c ---------------- --------------------------- %stddev %change %stddev \ | \ 17199 ± 8% -9.4% 15577 ± 4% numa-meminfo.node1.KernelStack 4350 ± 14% -16.1% 3649 ± 13% numa-meminfo.node1.PageTables 17199 ± 8% -9.4% 15574 ± 4% numa-vmstat.node1.nr_kernel_stack 1088 ± 14% -16.1% 913.51 ± 13% numa-vmstat.node1.nr_page_table_pages 2389657 -3.9% 2296088 perf-bench-futex.ops/s 7000 -4.9% 6658 perf-bench-futex.time.user_time 339.33 ± 19% +45.8% 494.61 ± 19% perf-sched.wait_and_delay.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 1991 ± 26% +93.3% 3850 ± 6% perf-sched.wait_and_delay.max.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 339.33 ± 19% +45.8% 494.60 ± 19% perf-sched.wait_time.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 1991 ± 26% +93.3% 3850 ± 6% perf-sched.wait_time.max.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 0.39 +1.7% 0.39 perf-stat.i.MPKI 9.267e+10 -3.9% 8.904e+10 perf-stat.i.branch-instructions 2.172e+08 -4.1% 2.082e+08 perf-stat.i.cache-misses 5.278e+08 -3.7% 5.084e+08 perf-stat.i.cache-references 1.09 +6.1% 1.15 perf-stat.i.cpi 2814 +4.3% 2935 perf-stat.i.cycles-between-cache-misses 5.631e+11 -5.8% 5.305e+11 perf-stat.i.instructions 0.92 -5.8% 0.87 perf-stat.i.ipc 0.39 +1.7% 0.39 perf-stat.overall.MPKI 1.09 +6.1% 1.15 perf-stat.overall.cpi 2815 +4.3% 2936 perf-stat.overall.cycles-between-cache-misses 0.92 -5.8% 0.87 perf-stat.overall.ipc 9.236e+10 -3.9% 8.875e+10 perf-stat.ps.branch-instructions 2.165e+08 -4.1% 2.075e+08 perf-stat.ps.cache-misses 5.26e+08 -3.7% 5.067e+08 perf-stat.ps.cache-references 5.612e+11 -5.8% 5.288e+11 perf-stat.ps.instructions 1.689e+14 -5.8% 1.592e+14 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