[tsvwg] Fwd: New Version Notification for draft-morton-tsvwg-codel-approx-fair-01.txt

Jonathan Morton <chromatix99@gmail.com> Mon, 09 March 2020 22:41 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Subject: [tsvwg] Fwd: New Version Notification for draft-morton-tsvwg-codel-approx-fair-01.txt
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> A new version of I-D, draft-morton-tsvwg-codel-approx-fair-01.txt
> has been successfully submitted by Jonathan Morton and posted to the
> IETF repository.
> 
> Name:		draft-morton-tsvwg-codel-approx-fair
> Revision:	01
> Title:		Controlled Delay Approximate Fairness AQM
> Document date:	2020-03-09
> Group:		Individual Submission
> Pages:		7
> URL:            https://www.ietf.org/internet-drafts/draft-morton-tsvwg-codel-approx-fair-01.txt
> Status:         https://datatracker.ietf.org/doc/draft-morton-tsvwg-codel-approx-fair/
> Htmlized:       https://tools.ietf.org/html/draft-morton-tsvwg-codel-approx-fair-01
> Htmlized:       https://datatracker.ietf.org/doc/html/draft-morton-tsvwg-codel-approx-fair
> Diff:           https://www.ietf.org/rfcdiff?url2=draft-morton-tsvwg-codel-approx-fair-01
> 
> Abstract:
>   This note presents CodelAF, or Controlled Delay Approximate Fairness
>   in full, as an alternative to single-queue AQM or Fair Queue
>   implementations in the low-cost or high-speed network hardware
>   spaces.  It builds on the seminal work in Codel [RFC8289], and guides
>   multiple competing flows towards similar throughputs by differential
>   congestion signalling, whilst requiring only a single FIFO queue.  It
>   may also be combined with CNQ [I-D.morton-tsvwg-cheap-nasty-queueing]
>   to provide a latency optimisation for sparse flows.

This -01 update adds a description of Twin-CodelAF, a simple method of adapting CodelAF to the task of providing a low-latency Diffserv PHB, with flow-fairness both between and within the traffic classes.  These properties obviate the usual need to perform admission control on a Diffserv class.

We have a proof-of-concept implementation in the usual place.  We should be able to make this a bit more mature in the coming days, improving the signalling performance and making it more configurable.  We've also added a similar capability to LFQ.  So we expect to talk more about this a little later.

 - Jonathan Morton