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Date:   Sun, 12 Apr 2020 22:17:52 +0200
From:   Václav Zindulka <>
To:     Cong Wang <>
Cc:     Linux Kernel Network Developers <>
Subject: Re: iproute2: tc deletion freezes whole server

On Wed, Apr 8, 2020 at 10:18 PM Cong Wang <> wrote:
> Hi, Václav

Hello Cong,

> Sorry for the delay.

No problem, I'm actually glad you are diagnosing the problem further.
I didn't have much time until today and late yesterday to apply
patches and to test it.

> The problem is actually more complicated than I thought, although it
> needs more work, below is the first pile of patches I have for you to
> test:
> It is based on the latest net-next branch. Please let me know the result.

I have applied all the patches in your four commits to my custom 5.4.6
kernel source. There was no change in the amount of fq_codel_reset
calls. Tested on ifb, RJ45 and SFP+ interfaces.

> Meanwhile, I will continue to work on this and will provide you more
> patches on top.

Thank you very much for your effort!

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