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d="scan'208";a="6875882" 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 17:04:50 -0800 Date: Thu, 5 Nov 2026 09:04:47 +0800 From: kernel test robot To: Kyle Zeng Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Lukas Maar , linux-kernel@vger.kernel.org, tglx@kernel.org, mingo@redhat.com, outbounddisclosures@openai.com, Kyle Zeng , yi1.lai@intel.com Subject: Re: [PATCH v2] futex: Use a keyed hash for global futex buckets Message-ID: <202611050816.9e42490c-lkp@intel.com> X-Mailing-List: oe-lkp@lists.linux.dev 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 In-Reply-To: <20261019183334.29433-1-kylebot@openai.com> Hello, kernel test robot noticed a -6.0% regression of will-it-scale.per_thread_ops on: commit: c44a057178cbedbc04c63404258524975e87a64f ("[PATCH v2] futex: Use a keyed hash for global futex buckets") url: https://github.com/intel-lab-lkp/linux/commits/Kyle-Zeng/futex-Use-a-keyed-hash-for-global-futex-buckets/20261019-113334 patch link: https://lore.kernel.org/all/20261019183334.29433-1-kylebot@openai.com/ patch subject: [PATCH v2] futex: Use a keyed hash for global futex buckets testcase: will-it-scale config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 512G memory parameters: nr_task: 100% mode: thread test: futex2 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/202611050816.9e42490c-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261105/202611050816.9e42490c-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/thread/100%/debian-13-x86_64-20250902.cgz/lkp-spr-2sp5/futex2/will-it-scale commit: 0fcb05b723 ("Merge tag 'libcrypto-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux") c44a057178 ("[PATCH v2] futex: Use a keyed hash for global futex buckets") 0fcb05b72344f408 c44a057178cbedbc04c63404258 ---------------- --------------------------- %stddev %change %stddev \ | \ 7.026e+08 -6.0% 6.607e+08 will-it-scale.224.threads 3136755 -6.0% 2949754 will-it-scale.per_thread_ops 7.026e+08 -6.0% 6.607e+08 will-it-scale.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