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Re: [tsvwg] Review comments on a careful read of the L4S ID

Tom Henderson <tomh@tomh.org> Thu, 06 May 2021 23:53 UTC

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To: "Black, David" <David.Black@dell.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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From: Tom Henderson <tomh@tomh.org>
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Date: Thu, 06 May 2021 16:53:39 -0700
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Subject: Re: [tsvwg] Review comments on a careful read of the L4S ID
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On 5/6/21 1:30 PM, Black, David wrote:
> Tom,
> 
> I'm the source of pushback here.  In my view, L4S is an interesting mix, as the L4S ID draft does not define a complete protocol - rather, it specifies the ECN marking mechanism and places requirements on the endpoint congestion control response without specifying that response in detail (e.g., to implement TCP Prague congestion control based on L4S, one also needs to also go look at a TCP Prague spec).
> 
> I'd be happy with "mechanism" or "functionality" but I don't see a fully implementable "protocol" here.  What do you think?

David,
While I agree that congestion control is not specified in detail, the 
title doesn't currently claim that it does.  It seems to me that 
sections 4 and 5 define the protocol rules for the use of ECN.  My 
earlier email suggested what more I thought could be included in those 
sections, but I'm not sure whether the authors intend to pick up those 
comments.

- Tom

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