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[84.3.50.134]) by smtp.gmail.com with ESMTPSA id x1sm3665602ejc.119.2020.08.06.06.34.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2020 06:34:54 -0700 (PDT) Date: Thu, 6 Aug 2020 15:34:52 +0200 From: Ingo Molnar To: kernel test robot , Dan Williams Cc: Dan Williams , tglx@linutronix.de, mingo@redhat.com, vishal.l.verma@intel.com, x86@kernel.org, stable@vger.kernel.org, Borislav Petkov , Vivek Goyal , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Linus Torvalds , Tony Luck , Erwin Tsaur , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, 0day robot , lkp@lists.01.org Subject: Re: [x86/copy_mc] a0ac629ebe: fio.read_iops -43.3% regression Message-ID: <20200806133452.GA2077191@gmail.com> References: <159630256804.3143511.8894023468833792004.stgit@dwillia2-desk3.amr.corp.intel.com> <20200803094257.GA23458@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200803094257.GA23458@shao2-debian> Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org * kernel test robot wrote: > Greeting, > > FYI, we noticed a -43.3% regression of fio.read_iops due to commit: > > > commit: a0ac629ebe7b3d248cb93807782a00d9142fdb98 ("x86/copy_mc: Introduce copy_mc_generic()") > url: https://github.com/0day-ci/linux/commits/Dan-Williams/Renovate-memcpy_mcsafe-with-copy_mc_to_-user-kernel/20200802-014046 > > > in testcase: fio-basic > on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 256G memory > with following parameters: So this performance regression, if it isn't a spurious result, looks concerning. Is this expected? Thanks, Ingo