netdev - RE: [PATCH v2 iproute2-next 1/1] tc: add dualpi2 scheduler module

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Message-ID:
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Date: Wed, 23 Oct 2024 17:50:54 +0000
From: "Chia-Yu Chang (Nokia)" <chia-yu.chang@...ia-bell-labs.com>
To: Stephen Hemminger <stephen@...workplumber.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "dsahern@...il.com"
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 Steen <henrist@...rist.net>
Subject: RE: [PATCH v2 iproute2-next 1/1] tc: add dualpi2 scheduler module

Hi Stephen,

	DualPI2 is independent from TCP Prague, so I will rephrase the description to make it more clear.
	Related to TCP Prague, it will be submitted in another patch series and can work without DualPI2.

Brs,
Chia-Yu

-----Original Message-----
From: Stephen Hemminger <stephen@...workplumber.org> 
Sent: Wednesday, October 23, 2024 5:52 PM
To: Chia-Yu Chang (Nokia) <chia-yu.chang@...ia-bell-labs.com>
Cc: netdev@...r.kernel.org; dsahern@...il.com; davem@...emloft.net; jhs@...atatu.com; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; dsahern@...nel.org; ij@...nel.org; ncardwell@...gle.com; Koen De Schepper (Nokia) <koen.de_schepper@...ia-bell-labs.com>; g.white@...leLabs.com; ingemar.s.johansson@...csson.com; mirja.kuehlewind@...csson.com; cheshire@...le.com; rs.ietf@....at; Jason_Livingood@...cast.com; vidhi_goel@...le.com; Olga Albisser <olga@...isser.org>; Olivier Tilmans (Nokia) <olivier.tilmans@...ia.com>; Bob Briscoe <research@...briscoe.net>; Henrik Steen <henrist@...rist.net>
Subject: Re: [PATCH v2 iproute2-next 1/1] tc: add dualpi2 scheduler module

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On Wed, 23 Oct 2024 13:04:34 +0200
chia-yu.chang@...ia-bell-labs.com wrote:

> + * DualPI Improved with a Square (dualpi2):
> + * - Supports congestion controls that comply with the Prague requirements
> + *   in RFC9331 (e.g. TCP-Prague)
> + * - Supports coupled dual-queue with PI2 as defined in RFC9332
> + * -

It is awkward that dualPI is referencing a variant of TCP congestion control that is not supported by Linux. Why has Nokia not upstreamed TCP Prague?

I would say if dualpi2 only makes sense with TCP Prague then the congestion control must be upstreamed first?