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a="2634027" X-IronPort-AV: E=Sophos;i="6.27,197,1787036400"; d="scan'208";a="2634027" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2026 17:53:10 -0800 X-CSE-ConnectionGUID: TzwXlRPATqqMRLBfipF6OQ== X-CSE-MsgGUID: 85+2EOpoR0Gshj6zqJkAhQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,197,1787036400"; d="scan'208";a="7277393" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.182.64]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Nov 2026 17:53:09 -0800 Date: Fri, 6 Nov 2026 09:53:05 +0800 From: kernel test robot To: Peter Zijlstra Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, aubrey.li@linux.intel.com, yu.c.chen@intel.com, yi1.lai@intel.com Subject: [linus:master] [sched/fair] fb1050ac8e: stress-ng.sleep.ops_per_sec 29.9% regression Message-ID: <202611060925.fb5500b1-lkp@intel.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Hello, kernel test robot noticed a 29.9% regression of stress-ng.sleep.ops_per_sec on: commit: fb1050ac8e40aaa014291b5b53612d27890c2b09 ("sched/fair: Change the default cgroup_mode to concur") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory parameters: nr_threads: 100% testtime: 60s test: sleep cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+---------------------------------------------------------------------------------------------+ | testcase: change | netperf: netperf.Throughput_Mbps -15.9% regression | | test machine | 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory | | test parameters | cluster=cs-localhost | | | cpufreq_governor=performance | | | ip=ipv4 | | | nr_threads=200% | | | runtime=300s | | | test=TCP_STREAM | +------------------+---------------------------------------------------------------------------------------------+ 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/202611060925.fb5500b1-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261106/202611060925.fb5500b1-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-spr-r02/sleep/stress-ng/60s commit: 507f910a4e ("sched/fair: Add cgroup_mode: tasks") fb1050ac8e ("sched/fair: Change the default cgroup_mode to concur") 507f910a4e1f140a fb1050ac8e40aaa014291b5b536 ---------------- --------------------------- %stddev %change %stddev \ | \ 96108453 -29.9% 67358809 stress-ng.sleep.ops 1599640 -29.9% 1120640 stress-ng.sleep.ops_per_sec 46082447 -29.1% 32658369 ± 2% stress-ng.time.involuntary_context_switches 15699 -11.3% 13918 stress-ng.time.percent_of_cpu_this_job_got 6459 -4.7% 6156 stress-ng.time.system_time 3034 -25.5% 2262 stress-ng.time.user_time 2.16e+09 -30.6% 1.5e+09 stress-ng.time.voluntary_context_switches *************************************************************************************************** lkp-srf-2sp3: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory ========================================================================================= cluster/compiler/cpufreq_governor/ip/kconfig/nr_threads/rootfs/runtime/tbox_group/test/testcase: cs-localhost/gcc-14/performance/ipv4/x86_64-rhel-9.4/200%/debian-13-x86_64-20250902.cgz/300s/lkp-srf-2sp3/TCP_STREAM/netperf commit: 507f910a4e ("sched/fair: Add cgroup_mode: tasks") fb1050ac8e ("sched/fair: Change the default cgroup_mode to concur") 507f910a4e1f140a fb1050ac8e40aaa014291b5b536 ---------------- --------------------------- %stddev %change %stddev \ | \ 3415 -15.9% 2871 netperf.ThroughputBoth_Mbps 1311602 -15.9% 1102665 netperf.ThroughputBoth_total_Mbps 3415 -15.9% 2871 netperf.Throughput_Mbps 1311602 -15.9% 1102665 netperf.Throughput_total_Mbps 3.906e+08 ± 2% -63.2% 1.439e+08 ± 2% netperf.time.involuntary_context_switches 184303 -3.2% 178397 netperf.time.minor_page_faults 11296 +1.6% 11478 netperf.time.percent_of_cpu_this_job_got 33938 +2.0% 34626 netperf.time.system_time 444.02 ± 2% -27.5% 321.87 ± 2% netperf.time.user_time 425106 ± 27% -48.3% 219585 ± 12% netperf.time.voluntary_context_switches 3.002e+09 -15.9% 2.524e+09 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