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a="2630956" X-IronPort-AV: E=Sophos;i="6.27,196,1787036400"; d="scan'208";a="2630956" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2026 16:38:50 -0800 X-CSE-ConnectionGUID: uRcZfDPTQACPdZzQ63gB0g== X-CSE-MsgGUID: iLMWVtDLQ3ulnBNpVVj06w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,196,1787036400"; d="scan'208";a="6866644" 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; 04 Nov 2026 16:38:48 -0800 Date: Thu, 5 Nov 2026 08:38:45 +0800 From: kernel test robot To: Breno Leitao Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Christian Brauner , Mateusz Guzik , Oleg Nesterov , linux-fsdevel@vger.kernel.org, yi1.lai@intel.com Subject: [linus:master] [fs/pipe] f7f4665dc5: lmbench3.PIPE.bandwidth.MB/sec 18.5% regression Message-ID: <202611041404.befe64cd-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 18.5% regression of lmbench3.PIPE.bandwidth.MB/sec on: commit: f7f4665dc520fd8bbc1db20e59945773e03744a0 ("fs/pipe: unify the page pools into a single per-pipe pool") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: lmbench3 config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 224 threads 2 sockets Intel(R) Xeon(R) (Sapphire Rapids) with 128G memory parameters: test_memory_size: 50% nr_threads: 20% mode: development test: PIPE 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/202611041404.befe64cd-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261104/202611041404.befe64cd-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_threads/rootfs/tbox_group/test/test_memory_size/testcase: gcc-14/performance/x86_64-rhel-9.4/development/20%/debian-13-x86_64-20250902.cgz/lkp-spr-2sp2/PIPE/50%/lmbench3 commit: c610d2d078 ("fs: annotate inode timestamp accessors") f7f4665dc5 ("fs/pipe: unify the page pools into a single per-pipe pool") c610d2d0787961cd f7f4665dc520fd8bbc1db20e599 ---------------- --------------------------- %stddev %change %stddev \ | \ 29142 ± 2% -18.5% 23737 lmbench3.PIPE.bandwidth.MB/sec 191.80 ± 8% +54.1% 295.65 ± 5% lmbench3.time.elapsed_time 191.80 ± 8% +54.1% 295.65 ± 5% lmbench3.time.elapsed_time.max 23261 ± 16% +19.3% 27743 ± 5% lmbench3.time.involuntary_context_switches 9853 ± 16% +27.9% 12605 ± 5% lmbench3.time.system_time 51.80 ± 2% +11.6% 57.80 ± 3% lmbench3.time.user_time 2.928e+08 ± 3% +26.6% 3.706e+08 ± 4% lmbench3.time.voluntary_context_switches 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