Re: [tsvwg] Alissa Cooper's Discuss on draft-ietf-tsvwg-rfc5405bis-18: (with DISCUSS)
"Eggert, Lars" <lars@netapp.com> Fri, 14 October 2016 13:23 UTC
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From: "Eggert, Lars" <lars@netapp.com>
To: Gorry Fairhust <gorry@erg.abdn.ac.uk>
Thread-Topic: Alissa Cooper's Discuss on draft-ietf-tsvwg-rfc5405bis-18: (with DISCUSS)
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Date: Fri, 14 Oct 2016 13:22:16 +0000
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Cc: "tsvwg@ietf.org" <tsvwg@ietf.org>, "David L. Black" <david.black@emc.com>, Alissa Cooper <alissa@cooperw.in>, "draft-ietf-tsvwg-rfc5405bis@ietf.org" <draft-ietf-tsvwg-rfc5405bis@ietf.org>, The IESG <iesg@ietf.org>, "tsvwg-chairs@ietf.org" <tsvwg-chairs@ietf.org>
Subject: Re: [tsvwg] Alissa Cooper's Discuss on draft-ietf-tsvwg-rfc5405bis-18: (with DISCUSS)
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Applied > On 2016-10-12, at 18:49, Gorry Fairhurst <gorry@erg.abdn.ac.uk> wrote: > > See below. > > On 12/10/2016 15:49, Alissa Cooper wrote: >> Alissa Cooper has entered the following ballot position for >> draft-ietf-tsvwg-rfc5405bis-18: Discuss >> >> When responding, please keep the subject line intact and reply to all >> email addresses included in the To and CC lines. (Feel free to cut this >> introductory paragraph, however.) >> >> >> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >> for more information about IESG DISCUSS and COMMENT positions. >> >> >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rfc5405bis/ >> >> >> >> ---------------------------------------------------------------------- >> DISCUSS: >> ---------------------------------------------------------------------- >> >> = Section 3.17 = >> >> "An application sending ECN-capable datagrams MUST provide an >> appropriate congestion reaction when it receives feedback >> indicating that congestion has been experienced. This must result >> in reduction of the sending rate by the UDP congestion control >> method (see Section 3.1) that is not less than the reaction of TCP >> under equivalent conditions." >> >> Is the second "must" meant to be normative? If so, this worries me a bit. >> RFC 6679 I believe retains flexibility for endpoints to react to >> congestion in ways that are different from TCP and dependent on specific >> codecs, topologies, and other factors. RFC 3551 provides a lot of >> qualification in the requirements it places around equivalence to TCP's >> behavior. So I would be concerned about how this requirement, if >> normative, would affect RTP and other protocols. >> >> If it's not meant to be normative, I would suggest using "ought to" or >> some other word. > I don't think the second "must" is a normative, because that would make it potentially contradict other RFCs (as you say). I think it describes the principle for design, so "ought to" would reflect that. > > Gorry > >
- [tsvwg] Alissa Cooper's Discuss on draft-ietf-tsv… Alissa Cooper
- Re: [tsvwg] Alissa Cooper's Discuss on draft-ietf… Gorry Fairhurst
- Re: [tsvwg] Alissa Cooper's Discuss on draft-ietf… Eggert, Lars