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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Hello, kernel test robot noticed a 3.8% regression of netperf.Throughput_tps on: commit: e213519c64ec899502f211079bb2a4603cb8ab53 ("sched/fair: Avoid a second scan of target in select_idle_cpu") https://gitee.com/anolis/intel-cloud-kernel.git devel-5.10 testcase: netperf config: x86_64-anolis-intel-cloud-devel-5.10 compiler: gcc-14 test machine: 256 threads 2 sockets Intel(R) Xeon(R) 6768P CPU @ 2.4GHz (Granite Rapids) with 64G memory parameters: ip: ipv4 runtime: 300s nr_threads: 200% cluster: cs-localhost test: TCP_RR 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/202610091252.d0d6cae8-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261009/202610091252.d0d6cae8-lkp@intel.com ========================================================================================= cluster/compiler/cpufreq_governor/ip/kconfig/nr_threads/rootfs/runtime/tbox_group/test/testcase: cs-localhost/gcc-14/performance/ipv4/x86_64-anolis-intel-cloud-devel-5.10/200%/debian-13-x86_64-20250902.cgz/300s/lkp-gnr-2sp4/TCP_RR/netperf commit: eb34bf470a ("sched/fair: Bring back select_idle_smt(), but differently") e213519c64 ("sched/fair: Avoid a second scan of target in select_idle_cpu") eb34bf470aa84e3d e213519c64ec899502f211079bb ---------------- --------------------------- %stddev %change %stddev \ | \ 28413404 -3.8% 27329713 ± 2% netperf.ThroughputBoth_total_tps 55494 -3.8% 53378 ± 2% netperf.ThroughputBoth_tps 28413404 -3.8% 27329713 ± 2% netperf.Throughput_total_tps 55494 -3.8% 53378 ± 2% netperf.Throughput_tps 1932 ± 2% -5.1% 1833 netperf.time.user_time 8.524e+09 -3.8% 8.199e+09 ± 2% netperf.workload 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