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Re: [tsvwg] start of WGLC on L4S drafts

Jonathan Morton <chromatix99@gmail.com> Wed, 22 September 2021 10:39 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Wed, 22 Sep 2021 13:39:40 +0300
Cc: wes@mti-systems.com, tsvwg@ietf.org
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To: Ruediger.Geib@telekom.de
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Subject: Re: [tsvwg] start of WGLC on L4S drafts
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> On 22 Sep, 2021, at 1:31 pm, <Ruediger.Geib@telekom.de> <Ruediger.Geib@telekom.de> wrote:
> 
> e) no IP flow based mechanism for the resource to be shared (doesn't scale well with available network provider HW to the extent I'm aware) - that means bulk traffic treatment only

Okay, then just use CoDel instead of FQ-CoDel.  All you lose is the isolation of flows' delay influences from each other, and the max-min fairness.  I would however suggest that you at least treat traffic to a subscriber as "a flow", and thus perform max-min fairness and delay isolation between subscribers.

With that said, I'm aware of production hardware that implements Approximate Fairness AQM at 100Gbps, and an implementation of FQ-CoDel in P4.  The latter, as far as I'm aware, should scale up to the point where you start using optical switching anyway, at which point the right strategy is probably over-provisioning.  Even software implementations of FQ-CoDel have been tested successfully at 40Gbps.

 - Jonathan Morton

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