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a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1697561818; bh=RCqEA4EjJgbOcZTfdfXQm/IITm2752KvO1ZvbyXbBW0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eFR/NVQeHNOupCOKU719/W4nPTEYiCvMSv9HU/vssvPFmBz0UQzqh6RdG2bLWJyJj 3sGEOGkj3F/7gKNEpuEUSKICBdhIDcDiISIr87JqhlER5c9uWT+ZVvI6n9m4zWt3a1 2wG3KMl9nDcu5ZMVW0n92Ay9ToJhaHmWeHOV6nxQ= Date: Tue, 17 Oct 2023 18:56:56 +0200 From: Greg Kroah-Hartman To: kernel test robot Cc: Max Kellermann , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , linux-kernel@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Subject: Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression Message-ID: <2023101759-front-ember-6354@gregkh> References: <202310172247.b9959bd4-oliver.sang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202310172247.b9959bd4-oliver.sang@intel.com> X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 16BC940004 X-Stat-Signature: nfrpmzorb9fc7pudcxecacyp9fg547hw X-HE-Tag: 1697561820-3284 X-HE-Meta: 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 KY5fEoPy RhezTwMx2hN/Zj1PNFqhium+9V4hgJ3i3BBcQHXKp4uQA4RwqEWeixuIkw98KjCYTv/1CqI5ZSM5ScELSU/PmtLFBwemKVUelhA9ZFIyIe5jYDplSbnYWmGyE82dZun9s4P55DGqdXxfHQQfWMGxjqDPFCn37ctkQHCSkh8dCL8VgyGEJiWFtiu/Ic7DlDZP+dBQ2RBicTcH4J52QvGjGIjMKXvOyudiO4JtBKWf7udrx5P7KaxIdxiJRl7bJesoRApRd/xLV8K8ixlpF+iDQqgO13dJxlewi1gUKQAQ7t/3cKAKUKLrv1GwuRU9rWyM96owi X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Oct 17, 2023 at 11:06:42PM +0800, kernel test robot wrote: > > > Hello, > > kernel test robot noticed a -99.8% regression of stress-ng.splice.ops_per_sec on: > > > commit: 1b057bd800c3ea0c926191d7950cd2365eddc9bb ("drivers/char/mem: implement splice() for /dev/zero, /dev/full") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > > testcase: stress-ng > test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory > parameters: > > nr_threads: 100% > testtime: 60s > class: pipe > test: splice > cpufreq_governor: performance > > > In addition to that, the commit also has significant impact on the following tests: > > +------------------+-------------------------------------------------------------------------------------------------+ > | testcase: change | stress-ng: stress-ng.splice.ops_per_sec 38.9% improvement | So everything now goes faster, right? -99.8% regression means 99.8% faster? thanks, greg k-h