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[iccrg] Updates to draft-briscoe-iccrg-prague-congestion-control-03

Bob Briscoe <ietf@bobbriscoe.net> Sat, 14 October 2023 12:44 UTC

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Subject: [iccrg] Updates to draft-briscoe-iccrg-prague-congestion-control-03
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iccrg,

We've just posted an update to prague-congestion-control.
Links to diffs are quoted below.
The main technical changes:

  * the Apple implementation falls back to CUBIC behaviour on loss (both
    the reduction and the subsequent increase). Currently the Linux
    implementation still falls back to Reno on loss, but that is being
    changed.
  * how the Apple implementation over QUIC behaves when the path or the
    remote peer fails to support ECN properly
  * the items already discussed on this list in response to Neal's
    review, some of which were editorial, but others were technical, e.g.
      o pseudocode for removing integer rounding bias
      o clarifying the RTT-independence approach

Cheers


Bob & co-authors



-------- Forwarded Message --------
Subject: 	New Version Notification for 
draft-briscoe-iccrg-prague-congestion-control-03.txt
Date: 	Sat, 14 Oct 2023 05:07:58 -0700
From: 	internet-drafts@ietf.org
To: 	Bob Briscoe <ietf@bobbriscoe.net>, Koen De Schepper 
<koen.de_schepper@nokia.com>, Olivier Tilmans 
<olivier.tilmans@nokia-bell-labs.com>, Vidhi Goel <vidhi_goel@apple.com>



A new version of Internet-Draft
draft-briscoe-iccrg-prague-congestion-control-03.txt has been successfully
submitted by Bob Briscoe and posted to the
IETF repository.

Name: draft-briscoe-iccrg-prague-congestion-control
Revision: 03
Title: Prague Congestion Control
Date: 2023-10-14
Group: Individual Submission
Pages: 34
URL: 
https://www.ietf.org/archive/id/draft-briscoe-iccrg-prague-congestion-control-03.txt
Status: 
https://datatracker.ietf.org/doc/draft-briscoe-iccrg-prague-congestion-control/
HTML: 
https://www.ietf.org/archive/id/draft-briscoe-iccrg-prague-congestion-control-03.html
HTMLized: 
https://datatracker.ietf.org/doc/html/draft-briscoe-iccrg-prague-congestion-control
Diff: 
https://author-tools.ietf.org/iddiff?url2=draft-briscoe-iccrg-prague-congestion-control-03

Abstract:

This specification defines the Prague congestion control scheme,
which is derived from DCTCP and adapted for Internet traffic by
implementing the Prague L4S requirements. Over paths with L4S
support at the bottleneck, it adapts the DCTCP mechanisms to achieve
consistently low latency and full throughput. It is defined
independently of any particular transport protocol or operating
system, but notes are added that highlight issues specific to certain
transports and OSs. It is mainly based on experience with the
reference Linux implementation of TCP Prague and the Apple
implementation over QUIC, but it includes experience from other
implementations where available.

The implementation does not satisfy all the Prague requirements (yet)
and the IETF might decide that certain requirements need to be
relaxed as an outcome of the process of trying to satisfy them all.
Future plans that have typically only been implemented as proof-of-
concept code are outlined in a separate section.



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