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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
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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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