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Re: [tsvwg] plan for L4S issue #29

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 01 October 2020 12:42 UTC

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Date: Thu, 01 Oct 2020 14:42:32 +0200
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
cc: Pete Heist <pete@heistp.net>, Greg White <g.white@CableLabs.com>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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Subject: Re: [tsvwg] plan for L4S issue #29
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On Thu, 1 Oct 2020, Gorry Fairhurst wrote:

> To be clear, is there a "safety" concern with respect to congestion 
> collapse from overload, or is it an issue concerning relative fairness 
> between flows?

I don't know where the cut-off is between these, but my worry is that one 
type of flow might only get few single digit percent of available bw which 
at slower connections (few megabit/s range) might mean the application 
using these flows might become unusable.

We've seen this in some tests already, at that time I believe it was 
during BBR development.

https://lists.bufferbloat.net/pipermail/cerowrt-devel/2016-September/010861.html

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

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