linux-kernel - Re: [PATCH v2] selftest: txtimestamp: fix net ns entry logic

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Date:   Wed, 22 Jul 2020 10:37:03 +0200
From:   Paolo Pisati <paolo.pisati@...onical.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Shuah Khan <shuah@...nel.org>, Jian Yang <jianyang@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] selftest: txtimestamp: fix net ns entry logic

On Tue, Jul 21, 2020 at 6:26 PM Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> Fixes: cda261f421ba ("selftests: add txtimestamp kselftest")
>
> Acked-by: Willem de Bruijn <willemb@...gle.com>

Besides, is it just me or this test fails frequently? I've been
running it on 5.4.x, 5.7.x and 5.8-rcX and it often fails:

...
    USR: 1595405084 s 947366 us (seq=0, len=0)
    SND: 1595405084 s 948686 us (seq=9, len=10)  (USR +1319 us)
ERROR: 6542 us expected between 6000 and 6500
    ACK: 1595405084 s 953908 us (seq=9, len=10)  (USR +6541 us)
    USR: 1595405084 s 997979 us (seq=0, len=0)
    SND: 1595405084 s 999101 us (seq=19, len=10)  (USR +1121 us)
    ACK: 1595405085 s 4438 us (seq=19, len=10)  (USR +6458 us)
    USR: 1595405085 s 49317 us (seq=0, len=0)
    SND: 1595405085 s 50680 us (seq=29, len=10)  (USR +1363 us)
ERROR: 6661 us expected between 6000 and 6500
    ACK: 1595405085 s 55978 us (seq=29, len=10)  (USR +6661 us)
    USR: 1595405085 s 101049 us (seq=0, len=0)
    SND: 1595405085 s 102342 us (seq=39, len=10)  (USR +1293 us)
ERROR: 6578 us expected between 6000 and 6500
    ACK: 1595405085 s 107627 us (seq=39, len=10)  (USR +6577 us)
    USR-SND: count=4, avg=1274 us, min=1121 us, max=1363 us
    USR-ACK: count=4, avg=6559 us, min=6458 us, max=6661 us


In particular, "run_test_v4v6 ${args}       # tcp" is the most
susceptible to failures (though i've seen the udp variant fail too).
-- 
bye,
p.