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Date:   Thu, 20 Aug 2020 15:43:17 +0800
From:   Jike Song <>
To:     Josh Hunt <>
Cc:     Paolo Abeni <>,
        Jonas Bonn <>,
        Cong Wang <>,
        Michael Zhivich <>,
        David Miller <>,
        John Fastabend <>,
        LKML <>,
        Linux Kernel Network Developers <>,
Subject: Re: Packet gets stuck in NOLOCK pfifo_fast qdisc

Hi Josh,

On Fri, Jul 3, 2020 at 2:14 AM Josh Hunt <> wrote:
> Initial results with Cong's patch look promising, so far no stalls. We
> will let it run over the long weekend and report back on Tuesday.
> Paolo - I have concerns about possible performance regression with the
> change as well. If you can gather some data that would be great. If
> things look good with our low throughput test over the weekend we can
> also try assessing performance next week.

We met possibly the same problem when testing nvidia/mellanox's
GPUDirect RDMA product, we found that changing NET_SCH_DEFAULT to
DEFAULT_FQ_CODEL mitigated the problem, having no idea why. Maybe you
can also have a try?

Besides, our testing is pretty complex, do you have a quick test to
reproduce it?


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