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Re: [tsvwg] L4S operational guidance draft

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 18 November 2020 07:26 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "Holland, Jake" <jholland@akamai.com>, 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 07:26:50 +0000
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Subject: Re: [tsvwg] L4S operational guidance draft
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OK, then I understand. Thanks!
/Ingemar

> -----Original Message-----
> From: Holland, Jake <jholland@akamai.com>
> Sent: den 18 november 2020 08:24
> 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; Ingemar Johansson S
> <ingemar.s.johansson@ericsson.com>
> Subject: Re: [tsvwg] L4S operational guidance draft
> 
> 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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