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Message-ID: <00da8188-8b8f-d1c0-ad8c-dfd79e52f289@intel.com> Date: Thu, 11 Nov 2021 11:29:59 +0800 From: Yin Fengwei <fengwei.yin@...el.com> To: Mickaël Salaün <mic@...ikod.net>, Kees Cook <keescook@...omium.org>, kernel test robot <oliver.sang@...el.com> CC: <lkp@...ts.01.org>, <lkp@...el.com>, <ying.huang@...el.com>, <feng.tang@...el.com>, <zhengjun.xing@...ux.intel.com>, Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>, "Aleksa Sarai" <cyphar@...har.com>, Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>, Casey Schaufler <casey@...aufler-ca.com>, Christian Brauner <christian.brauner@...ntu.com>, Christian Heimes <christian@...hon.org>, Deven Bowers <deven.desai@...ux.microsoft.com>, Dmitry Vyukov <dvyukov@...gle.com>, Eric Biggers <ebiggers@...nel.org>, Eric Chiang <ericchiang@...gle.com>, Florian Weimer <fweimer@...hat.com>, "Geert Uytterhoeven" <geert@...ux-m68k.org>, James Morris <jmorris@...ei.org>, "Jan Kara" <jack@...e.cz>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>, "Madhavan T . Venkataraman" <madvenka@...ux.microsoft.com>, Matthew Garrett <mjg59@...gle.com>, Matthew Wilcox <willy@...radead.org>, Miklos Szeredi <mszeredi@...hat.com>, Mimi Zohar <zohar@...ux.ibm.com>, Paul Moore <paul@...l-moore.com>, Philippe Trébuchet <philippe.trebuchet@....gouv.fr>, Scott Shell <scottsh@...rosoft.com>, "Shuah Khan" <shuah@...nel.org>, Steve Dower <steve.dower@...hon.org>, Steve Grubb <sgrubb@...hat.com>, Thibaut Sautereau <thibaut.sautereau@....gouv.fr>, Vincent Strubel <vincent.strubel@....gouv.fr>, <kernel-hardening@...ts.openwall.com>, <linux-api@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>, <linux-integrity@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-security-module@...r.kernel.org>, Mickaël Salaün <mic@...ux.microsoft.com> Subject: Re: [fs] a0918006f9: netperf.Throughput_tps -11.6% regression On 11/10/2021 4:52 PM, Mickaël Salaün wrote: >>> ---------------- --------------------------- >>> %stddev %change %stddev >>> \ | \ >>> 555600 -0.1% 555305 netperf.Throughput_total_tps >>> 34725 -0.1% 34706 netperf.Throughput_tps >>> >>> >>> Fengwei also helped review these results and commented: >>> I suppose these three CPUs have different cache policy. It also could be >>> related with netperf throughput testing. >> Does moving the syscall implementation somewhere else change things? >> That's a _huge_ performance change for something that isn't even called. >> What's going on here? > This regression doesn't make sense. I guess this is the result of a > flaky netperf test, maybe because the test machine was overloaded at > that time. I agree the test result looks strange. But I don't think the test machine or test methodology has issue. It's not possible the test box is overloaded when test case is running. We did test several times (> 12 times) on different days. Thanks. Regards Yin, Fengwei
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