linux-kernel - Re: [fs] a0918006f9: netperf.Throughput

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Date:   Fri, 12 Nov 2021 20:25:14 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     Kees Cook <keescook@...omium.org>,
        kernel test robot <oliver.sang@...el.com>
CC:     Mickaël Salaün <mic@...ikod.net>,
        <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>,
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        Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [fs] a0918006f9: netperf.Throughput_tps -11.6% regression

Hi Kees,

On 11/10/2021 1:21 AM, Kees Cook wrote:
>> 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?
I moved the syscall implementation to a stand alone file and put the file
to net directory for testing. The new patch is like:
https://zerobin.net/?a2b782afadf3c428#Me8l4AJuhiSCfaLVWVzydAVIK6ves0EVIVD76wLnVQo=


The test result is like following:
     - on Cascade Lake: -10.4%
    356365           -10.4%     319180        netperf.Throughput_total_tps
     22272           -10.4%      19948        netperf.Throughput_tps


     - on Cooper Lake: -4.0%
    345772 ±  4%      -4.0%     331814        netperf.Throughput_total_tps
     21610 ±  4%      -4.0%      20738        netperf.Throughput_tps


     - on Ice Lake: -1.1%
    509824            -1.1%     504434        netperf.Throughput_total_tps
     31864            -1.1%      31527        netperf.Throughput_tps


Regards
Yin, Fengwei