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Date:   Thu, 03 Sep 2020 10:39:54 +0200
From:   Paolo Abeni <>
To:     Cong Wang <>,
        Kehuan Feng <>
Cc:     Hillf Danton <>, Jike Song <>,
        Josh Hunt <>,
        Jonas Bonn <>,
        Michael Zhivich <>,
        David Miller <>,
        John Fastabend <>,
        LKML <>,
        Netdev <>
Subject: Re: Packet gets stuck in NOLOCK pfifo_fast qdisc

On Wed, 2020-09-02 at 22:01 -0700, Cong Wang wrote:
> Can you test the attached one-line fix? I think we are overthinking,
> probably all
> we need here is a busy wait.

I think that will solve, but I also think that will kill NOLOCK
performances due to really increased contention.

At this point I fear we could consider reverting the NOLOCK stuff.
I personally would hate doing so, but it looks like NOLOCK benefits are
outweighed by its issues.

Any other opinion more than welcome!



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