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

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Message-ID: <b88ee99e-92da-ac90-a726-a79db80f6b4@tarent.de>
Date: Tue, 16 May 2023 22:20:07 +0200 (CEST)
From: Thorsten Glaser <t.glaser@...ent.de>
To: Toke Høiland-Jørgensen <toke@...e.dk>
cc: Stephen Hemminger <stephen@...workplumber.org>, 
    Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, 
    Haye.Haehne@...ekom.de
Subject: Re: knob to disable locally-originating qdisc optimisation?

On Tue, 16 May 2023, Toke Høiland-Jørgensen wrote:

>Pushing stuff into a
>qdisc so it can be ECN-marked is also nonsensical for locally generated
>traffic; you don't need the ECN roundtrip, you can just directly tell
>the local TCP sender to slow down (which is exactly what TSQ does).

Yes, but the point of this exercise is to develop algorithms which
react to ECN marking; in production, the RAN BTS will do the marking
so the sender will not be at the place where congestion happens, so
adding that kind of insight is not needed.

Some people have asked for the ability to make Linux behave as if
the sender was remote to ease the test setup (i.e. require one less
machine), nothing more.

bye,
//mirabilos
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