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Re: [tsvwg] L4S and QUIC

"De Schepper, Koen (Nokia - BE/Antwerp)" <koen.de_schepper@nokia-bell-labs.com> Mon, 02 November 2020 13:06 UTC

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From: "De Schepper, Koen (Nokia - BE/Antwerp)" <koen.de_schepper@nokia-bell-labs.com>
To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>, "tsvwg@ietf.org" <tsvwg@ietf.org>
CC: Christian Huitema <huitema@huitema.net>, "Bob Briscoe (ietf@bobbriscoe.net)" <ietf@bobbriscoe.net>
Thread-Topic: L4S and QUIC
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Date: Mon, 02 Nov 2020 13:05:59 +0000
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Subject: Re: [tsvwg] L4S and QUIC
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Hi Ingemar,

Would indeed be very useful! I would suggest to include on top of DCTCP, the Prague extensions we added for better pacing and RTT independence. We know that the current DCTCP implementation has quite some flaws and performs worse than expected. Agreed that this is mainly due to the implementation (precision limitations and interaction with GRO) and not due to the principles. I think whatever we is proven and stable in Prague can easily be included.

Regards,
Koen.


From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Sent: Monday, November 2, 2020 9:01 AM
To: tsvwg@ietf.org
Cc: Christian Huitema <huitema@huitema.net>; Bob Briscoe (ietf@bobbriscoe.net) <ietf@bobbriscoe.net>; De Schepper, Koen (Nokia - BE/Antwerp) <koen.de_schepper@nokia-bell-labs.com>; Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Subject: L4S and QUIC

Hi
As a kind of clarification (if needed/wanted) on the topic.
L4S was considered early on when ECN support was added to QUIC. See for instance this page
https://github.com/quicwg/base-drafts/wiki/ECN-in-QUIC
At some stage it was discussed if a report on CE marked bytes would have been beneficial but it was deemed that packet counters were sufficient.

L4S support is currently not defined in the QUIC recovery drafts, I believe that the rationale was too keep the functionality minimal in the first QUIC version.

Now that L4S appears to be getting traction then I would believe that it makes sense to add L4S support also in QUIC and because DCTCP is already an RFC I believe that it can be a good idea to add the necessary pseudo code for DCTCP in a future version of the QUIC recovery draft and the necessary procedures to enable L4S in QUIC transport.
The reference to DCTCP does of course not preclude the use of other CCs like Prague or BBRv2 but I believe that DCTCP is reasonably small (pseudo code wise) and it can also work well for interop testing and for instance edge cloud experiments. And it also gives some additional time for BBRv2 and Prague to mature.
/Ingemar
================================
Ingemar Johansson  M.Sc.
Master Researcher

Ericsson Research
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