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d="scan'208";a="4291569" 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; 26 Oct 2026 20:02:24 -0700 Date: Tue, 27 Oct 2026 11:02:21 +0800 From: kernel test robot To: =?iso-8859-1?B?Suly6W15?= Jean Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Christian Brauner , yi1.lai@intel.com Subject: [linus:master] [nsfs] 82e9343260: stress-ng.signest.ops_per_sec 4.1% regression Message-ID: <202610271038.d2f16428-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=us-ascii Content-Disposition: inline Hello, kernel test robot noticed a 4.1% regression of stress-ng.signest.ops_per_sec on: commit: 82e9343260dfc6dda6349f285d9a5eac3e0738d7 ("nsfs: keep namespace tree fields stable until after RCU grace period") 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: signest cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+---------------------------------------------------------------------------------------------+ | testcase: change | stress-ng: stress-ng.sigill.ops_per_sec -3.6% regression | | test machine | 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory | | test parameters | cpufreq_governor=performance | | | nr_threads=100% | | | test=sigill | | | testtime=60s | +------------------+---------------------------------------------------------------------------------------------+ 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/202610271038.d2f16428-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261027/202610271038.d2f16428-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/signest/stress-ng/60s commit: 0ecd56573c ("ext4: Avoid entering writeback paths during fastcommit replay") 82e9343260 ("nsfs: keep namespace tree fields stable until after RCU grace period") 0ecd56573c1f272c 82e9343260dfc6dda6349f285d9 ---------------- --------------------------- %stddev %change %stddev \ | \ 33691 +4.3% 35127 stress-ng.signest.nanosec_to_handle_a_signal 3.989e+08 -4.1% 3.826e+08 stress-ng.signest.ops 6646641 -4.1% 6374889 stress-ng.signest.ops_per_sec 147.25 -3.8% 141.70 stress-ng.time.user_time *************************************************************************************************** lkp-spr-r02: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory ========================================================================================= 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/sigill/stress-ng/60s commit: 0ecd56573c ("ext4: Avoid entering writeback paths during fastcommit replay") 82e9343260 ("nsfs: keep namespace tree fields stable until after RCU grace period") 0ecd56573c1f272c 82e9343260dfc6dda6349f285d9 ---------------- --------------------------- %stddev %change %stddev \ | \ 3.977e+08 -3.6% 3.835e+08 stress-ng.sigill.ops 6645057 -3.6% 6408021 stress-ng.sigill.ops_per_sec 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