linux-kernel - Re: [PATCH 3/3] selftests: net: Add FIN_ACK processing order related latency spike test

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Message-ID: <CANn89iJrwVuEUHFqH1iCJd3nwTWAuXCdEJozwz6gzDV5Snm3Ug@mail.gmail.com>
Date:   Fri, 31 Jan 2020 06:56:13 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     sjpark@...zon.com
Cc:     David Miller <davem@...emloft.net>, Shuah Khan <shuah@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, sj38.park@...il.com,
        aams@...zon.com, SeongJae Park <sjpark@...zon.de>
Subject: Re: [PATCH 3/3] selftests: net: Add FIN_ACK processing order related
 latency spike test

On Fri, Jan 31, 2020 at 4:25 AM <sjpark@...zon.com> wrote:
>
> From: SeongJae Park <sjpark@...zon.de>
>
> This commit adds a test for FIN_ACK process races related reconnection
> latency spike issues.  The issue has described and solved by the
> previous commit ("tcp: Reduce SYN resend delay if a suspicous ACK is
> received").
>

I do not know for other tests, but using a hard coded port (4242) is
going to be flakky, since the port might be already used.

Please make sure to run tests on a separate namespace.