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[tcpPrague] Re: Reno fallback

Greg White <g.white@CableLabs.com> Wed, 24 July 2024 22:34 UTC

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From: Greg White <g.white@CableLabs.com>
To: Anna Brunström <anna.brunstrom@kau.se>, Szilveszter Nadas <Szilveszter.Nadas=40ericsson.com@dmarc.ietf.org>, "tcpprague@ietf.org" <tcpprague@ietf.org>
Thread-Topic: [tcpPrague] Re: Reno fallback
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Subject: [tcpPrague] Re: Reno fallback
List-Id: "To coordinate implementation and standardisation of TCP Prague across platforms. TCP Prague will be an evolution of DCTCP designed to live alongside other TCP variants and derivatives." <tcpprague.ietf.org>
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Also, Koen commented in CCWG this afternoon that Apple’s QUIC-Prague does fall back to Cubic behavior on loss.

-Greg


From: Anna Brunström <anna.brunstrom@kau.se>
Date: Wednesday, July 24, 2024 at 3:19 PM
To: Szilveszter Nadas <Szilveszter.Nadas=40ericsson.com@dmarc.ietf.org>, "tcpprague@ietf.org" <tcpprague@ietf.org>
Subject: [tcpPrague] Re: Reno fallback

Hi,

As a data point connected to Szilveszter’s question, we have been running some Prague experiments over 5G.  We have seen that when there is packet loss Pargue performs significantly worse than Cubic.

Cheers,
Anna

From: Szilveszter Nadas <Szilveszter.Nadas=40ericsson.com@dmarc.ietf.org>
Sent: den 24 juli 2024 22:34
To: tcpprague@ietf.org
Subject: [tcpPrague] Reno fallback

Hi,

I asked this question at ANRW yesterday, and would like to repeat this here:

-Why Prague is based on Reno, and uses Reno for loss response, as opposed to Cubic?
--Is it just historic reason, as DCTCP is also based on Reno?
--Is there any fundamental issues to base it on Cubic?
--Is there a Prague or Prague-like CC based on Cubic? I heard rumors about Apple having such a CC implementation.

I think it would be important to use Cubic, because Prague is supposed to work well in environments, where the congestion signal is loss, and Cubic is more efficient in those cases.

Cheers,
Szilveszter

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