netdev - Re: Packet gets stuck in NOLOCK pfifo

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Message-ID: <CAM_iQpV-JMURzFApp-Zhxs3QN9j=Zdf6yqwOP=E42ERDHxe6Hw@mail.gmail.com>
Date:   Wed, 2 Sep 2020 22:01:17 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Kehuan Feng <kehuan.feng@...il.com>
Cc:     Hillf Danton <hdanton@...a.com>, Jike Song <albcamus@...il.com>,
        Josh Hunt <johunt@...mai.com>, Paolo Abeni <pabeni@...hat.com>,
        Jonas Bonn <jonas.bonn@...rounds.com>,
        Michael Zhivich <mzhivich@...mai.com>,
        David Miller <davem@...emloft.net>,
        John Fastabend <john.fastabend@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: Packet gets stuck in NOLOCK pfifo_fast qdisc

Hello, Kehuan

Can you test the attached one-line fix? I think we are overthinking,
probably all
we need here is a busy wait.

Thanks.

View attachment "qdisc-seqlock.diff" of type "text/x-patch" (530 bytes)