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Re: [tsvwg] Requesting TSVWG adoption of SCE draft-morton-tsvwg-sce

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Tue, 19 November 2019 10:30 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Michael Welzl <michawe@ifi.uio.no>, Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>
CC: "Holland, Jake" <jholland@akamai.com>, "tsvwg@ietf.org" <tsvwg@ietf.org>, "<gorry@erg.abdn.ac.uk> Fairhurst" <gorry@erg.abdn.ac.uk>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [tsvwg] Requesting TSVWG adoption of SCE draft-morton-tsvwg-sce
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Date: Tue, 19 Nov 2019 10:30:19 +0000
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Subject: Re: [tsvwg] Requesting TSVWG adoption of SCE draft-morton-tsvwg-sce
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Hi Michael
Fair point, or perhaps in this discussion, I should use another word than "fair" to avoid confusion 😊

Yes. I know the paper discussed CoDel, what I wanted to point out however that CoDel has its own share of issues related to link underutilization at higher RTTs, meaning that the 5ms threshold is not good enough in all cases. My interpretation is that for classic traffic you need to set the thresholds differently depending on what RTT you expect your e2e traffic to experience.

/Ingemar

> -----Original Message-----
> From: Michael Welzl <michawe@ifi.uio.no>
> Sent: den 19 november 2019 11:20
> To: Ingemar Johansson S
> <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>
> Cc: Holland, Jake <jholland@akamai.com>; tsvwg@ietf.org;
> <gorry@erg.abdn.ac.uk> Fairhurst <gorry@erg.abdn.ac.uk>; Ingemar
> Johansson S <ingemar.s.johansson@ericsson.com>
> Subject: Re: [tsvwg] Requesting TSVWG adoption of SCE draft-morton-
> tsvwg-sce
> 
> JUST A CORRECTION  (*), because that was our work:
> 
> > FQ-CoDel is not problem free either see
> > https://protect2.fireeye.com/v1/url?k=e91d5acb-b58f57d4-e91d1a50-
> 0cc47
> > ad93db4-16a1170b93824c3b&q=1&e=74431335-0146-453f-a47c-
> fe14226bcc52&u=
> >
> http%3A%2F%2Fdl.ifip.org%2Fdb%2Fconf%2Fnetworking%2Fnetworking201
> 7%2F1570335770.pdf , which later on led to the alternate recommendations
> in RFC8511, in other words the unfairness issues are to be addressed in the
> endpoints.
> 
> We only evaluated CoDel, not FQ-CoDel, and this didn’t focus on fairness.
> FQ_* is quite fair AFAIK  :-)
> 
> So… the unfairness issue wasn’t the argument in this paper that led to RFC
> 8511.
> 
> Cheers,
> Michael
> 
> ---
> (*) the use of capitals here means: I am NOT a participant in this discussion,
> OH MY GOD I am not, PLEASE don’t involve me!!!   … I’m merely correcting a
> statement about our own earlier work.  I do enjoy watching the debate from
> a safe distance, though.

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