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Re: [tsvwg] L4S operational guidance draft

"Holland, Jake" <jholland@akamai.com> Wed, 18 November 2020 07:24 UTC

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From: "Holland, Jake" <jholland@akamai.com>
To: Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>, Pete Heist <pete@heistp.net>, Wesley Eddy <wes@mti-systems.com>
CC: "tsvwg@ietf.org" <tsvwg@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [tsvwg] L4S operational guidance draft
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Date: Wed, 18 Nov 2020 07:24:01 +0000
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Subject: Re: [tsvwg] L4S operational guidance draft
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Hi Ingemar,

On 11/17/20, 10:44 PM, "Ingemar Johansson S" <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org> wrote:
> I interpret this as: 
> 1) Flow queue AQMs don't work properly across tunnels, as flow isolation based om 5-tuple does not work
> 2) L4S flows can potentially (or will) get an unfair share as a consequence of #1 above because the bootleneck only implement a RFC3168 ECN marking. 
>
> Is this understanding correct ?

Yes, that's the issue.

The point being that FQ has the same troubles as shared queue for traffic
that shares a tunnel, so FQ on its own is not enough of a mitigation for
that use case, but the -01 version of the operational guidance draft
doesn't really cover that point yet.

Best regards,
Jake

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