netdev - Re: knob to disable locally-originating qdisc optimisation?

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Message-ID: <998e27d4-8a-2fd-7495-a8448a5427f9@tarent.de>
Date: Tue, 16 May 2023 18:38:42 +0200 (CEST)
From: Thorsten Glaser <t.glaser@...ent.de>
To: Stephen Hemminger <stephen@...workplumber.org>
cc: Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, 
    Haye.Haehne@...ekom.de, 
    Toke Høiland-Jørgensen <toke@...e.dk>
Subject: Re: knob to disable locally-originating qdisc optimisation?

On Thu, 27 Apr 2023, Stephen Hemminger wrote:

>On Thu, 27 Apr 2023 13:21:26 -0700
>Jakub Kicinski <kuba@...nel.org> wrote:

>> Doesn't ring a bell, what's your setup?

Intel NUC with Debian bullseye on it and a custom qdisc that
limits and delays outgoing traffic, therefore occasionally
returning NULL from .dequeue even if the qdisc is not empty.

iperf3 sending from the same NUC to a device on the network
behind that qdisc where the corresponding iperf server runs.

>It might be BQL trying to limit outstanding packets locally.

Possibly?

Thanks,
//mirabilos
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