netdev - Re: iproute2: tc deletion freezes whole server

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Message-ID: <CANxWus9xn=Z=rZ6BBZBMHNj6ocWU5dZi3PkOsQtAdgjyUdJ2zg@mail.gmail.com>
Date:   Sun, 12 Apr 2020 22:17:52 +0200
From:   Václav Zindulka <vaclav.zindulka@...pnet.cz>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: iproute2: tc deletion freezes whole server

On Wed, Apr 8, 2020 at 10:18 PM Cong Wang <xiyou.wangcong@...il.com> 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:
>
> https://github.com/congwang/linux/commits/qdisc_reset
>
> 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!