Re: [tsvwg] [Ecn-sane] Compatibility with singlw queue RFC3168 AQMs

Mikael Abrahamsson <swmike@swm.pp.se> Wed, 07 August 2019 10:06 UTC

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Date: Wed, 7 Aug 2019 12:06:08 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Jonathan Morton <chromatix99@gmail.com>
cc: "tsvwg@ietf.org" <tsvwg@ietf.org>, Bob Briscoe <ietf@bobbriscoe.net>, "Black, David" <David.Black@dell.com>, "ecn-sane@lists.bufferbloat.net" <ecn-sane@lists.bufferbloat.net>, Dave Taht <dave@taht.net>, "De Schepper, Koen (Nokia - BE/Antwerp)" <koen.de_schepper@nokia-bell-labs.com>
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Subject: Re: [tsvwg] [Ecn-sane] Compatibility with singlw queue RFC3168 AQMs
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On Wed, 7 Aug 2019, Mikael Abrahamsson wrote:

> I realise this is problematic and gets in the way of progress but the 
> Internet is a messy place and we need to do mitigation of pathological 
> cases where new and old don't always play nice together.

I forgot to also mention that I still would like to see more testing of 
the benefits of removing the ordering requirement on some traffic. Having 
been exposed to different medias over the past 25 years I've seen numerous 
Head-of-Line blocking problems my fair share of time and removing this 
ordering requirement would free up some medias to deliver some packets 
even though other packets are being re-transmitted and delivered later.

I also encourage if we can reach overall consensus that transports should 
take into account that packets can be re-ordered and what timescales would 
be acceptable for this to happen (1ms? 10ms? 100ms? Even more? Less? Not 
at all?)

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