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Re: [tsvwg] plan for L4S issue #29

Greg White <g.white@CableLabs.com> Tue, 29 September 2020 22:48 UTC

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From: Greg White <g.white@CableLabs.com>
To: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, "Rodney W. Grimes" <ietf@gndrsh.dnsmgr.net>, Mikael Abrahamsson <swmike=40swm.pp.se@dmarc.ietf.org>
CC: "tsvwg@ietf.org" <tsvwg@ietf.org>
Thread-Topic: [tsvwg] plan for L4S issue #29
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Date: Tue, 29 Sep 2020 22:48:18 +0000
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Subject: Re: [tsvwg] plan for L4S issue #29
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On 9/29/20, 10:05 AM, "tsvwg on behalf of Gorry Fairhurst" <tsvwg-bounces@ietf.org on behalf of gorry@erg.abdn.ac.uk> wrote:

    See below.
    
    On 29/09/2020 16:49, Rodney W. Grimes wrote:
    >> On Mon, 28 Sep 2020, Gorry (erg) wrote:
    >>
    >>> At some point the working group needs to publish the spec. - This final
    >>> stage is taking longer than I would hope, and I do hope that will be
    >>> seeing a WGLC soon.
    >> Do we actually?
    Yes.

    >> I still haven't ruled out that we decide not to use these bits, for now,
    >> because we don't know enough how it will affect the entire Internet.
    
    Still possible, if the WG as a whole decides that.

We're talking about WGLC to begin an experiment. The interest by the community in achieving the expected benefits of L4S was well represented at the consensus call. I believe that the WG needs to honor the consensus position and move forward with planning the experiment. With appropriate guidance I believe the experiment can commence and we can begin to understand whether any of the concerns raised are real, and if they are, how to resolve them. For the L4S Operational Guidance draft, I would appreciate constructive input from those who are interested in making the experiment a success (thanks already to Sebastian for his comments).  Important aspects include: If a sender wishes to test an L4S congestion control algorithm (Prague or otherwise) what should they be monitoring to understand how much of a benefit are they getting, what impact are they causing to non-L4S flows, etc.? If a network operator wishes to test an L4S compliant network element, what should they monitor?  What actions should either entity take with the resulting information?  

In my opinion, Issue 29 can be closed. RFC3168 detection should continue to evolve and should be referenced in the Operational Guidance draft, but fallback should not be required in the experimental protocol drafts for the reasons outlined in Issue 29, and on the mailing list.

-Greg
    
[snip]

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