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X-MS-Exchange-CrossTenant-UserPrincipalName: UGsLJaXAp1098e4s+VDXidVKH33nKUiPR7oyg/wvV5vA7/H/hhWItlS9O3RR56XvERSG8C3BHuPE/PvLYelarg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR11MB7033 X-OriginatorOrg: intel.com Hello, we reported "[tip:locking/futex] [futex] b04b8f3032: perf-bench-futex.ops/s 3.9% regression" in https://lore.kernel.org/all/202505191048.c1220460-lkp@intel.com/ now the commit is in mainline. we rebuild the kernels and rerun the tests, still see the similar regression. report again FYI. kernel test robot noticed a 4.1% regression of perf-bench-futex.ops/s on: commit: b04b8f3032aae6121303bfa324c768faba032242 ("futex: Introduce futex_q_lockptr_lock()") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master f09079bd04a924c72d555cd97942d5f8d7eca98c] [still regression on linux-next/master b27cc623e01be9de1580eaa913508b237a7a9673] 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/202506131635.f3240923-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250613/202506131635.f3240923-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 \ | \ 2390532 -4.1% 2293415 perf-bench-futex.ops/s 6999 -4.7% 6669 perf-bench-futex.time.user_time 18413 ± 4% -19.3% 14855 ± 2% perf-c2c.DRAM.remote 102464 ± 3% -15.0% 87089 ± 4% perf-c2c.HITM.local 18212 ± 4% -19.4% 14683 ± 2% perf-c2c.HITM.remote 120676 ± 3% -15.7% 101772 ± 4% perf-c2c.HITM.total 0.39 +1.9% 0.39 perf-stat.i.MPKI 9.27e+10 -4.0% 8.894e+10 perf-stat.i.branch-instructions 2.175e+08 -4.1% 2.086e+08 perf-stat.i.cache-misses 5.28e+08 -4.2% 5.06e+08 perf-stat.i.cache-references 1.09 +6.3% 1.16 perf-stat.i.cpi 2810 +4.3% 2931 perf-stat.i.cycles-between-cache-misses 5.633e+11 -5.9% 5.299e+11 perf-stat.i.instructions 0.92 -5.9% 0.87 perf-stat.i.ipc 0.39 +1.9% 0.39 perf-stat.overall.MPKI 1.09 +6.3% 1.15 perf-stat.overall.cpi 2811 +4.3% 2932 perf-stat.overall.cycles-between-cache-misses 0.92 -5.9% 0.87 perf-stat.overall.ipc 9.239e+10 -4.0% 8.865e+10 perf-stat.ps.branch-instructions 2.168e+08 -4.1% 2.079e+08 perf-stat.ps.cache-misses 5.263e+08 -4.2% 5.043e+08 perf-stat.ps.cache-references 5.614e+11 -5.9% 5.282e+11 perf-stat.ps.instructions 1.69e+14 -6.0% 1.589e+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