Re: [rtcweb] Some language on "prioritization"
"Matthew Kaufman (SKYPE)" <matthew.kaufman@skype.net> Mon, 31 March 2014 17:50 UTC
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From: "Matthew Kaufman (SKYPE)" <matthew.kaufman@skype.net>
To: Harald Alvestrand <harald@alvestrand.no>
Thread-Topic: [rtcweb] Some language on "prioritization"
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Date: Mon, 31 Mar 2014 17:49:45 +0000
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References: <5339A120.3040909@alvestrand.no> <CABkgnnVUHUx+3wY3Dsi=UvNkUw_Es1apeMSonq7DtEg_3UKRNg@mail.gmail.com> <FBA84C78-FE8E-4FEF-8AD3-CAF24C57E512@lurchi.franken.de>, <5339AA58.9070301@alvestrand.no>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Some language on "prioritization"
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And if SCTP and RTP have packets to send, which goes first, why, and under what circumstances? Matthew Kaufman (Sent from my iPhone) > On Mar 31, 2014, at 10:48 AM, "Harald Alvestrand" <harald@alvestrand.no> wrote: > >> On 03/31/2014 07:42 PM, Michael Tuexen wrote: >>> On 31 Mar 2014, at 19:38, Martin Thomson <martin.thomson@gmail.com> wrote: >>> >>>> On 31 March 2014 10:08, Harald Alvestrand <harald@alvestrand.no> wrote: >>>> -- TODO: Specify a relative priority scheme that makes sense with SCTP, >>>> with an appropriate reference. [draft-ietf-tsvwg-sctp-prpolicies] >>>> specifies a priority policy, but it's about discarding packets, not >>>> deciding which packets to send first, and it also makes it impossible to >>>> specify time-bounded retransmission. -- >>> >>> Why would SCTP need special treatment? I can understand if there are >>> particular time-sensitive control messages that need to be given >>> higher priority, but this is all time-sensitive. >> A single transport connection (in this case an SCTP association) can >> only use a single DSCP. So it would be OK to use the same priority for >> all data channels, but things get complicated when when some data channels >> would have different priorities requiring different DSCP markings. > > The SCTP protocol machine will, at some given moment in time, have > packets in its send buffers that belong to multiple data channels. Only > one of them can go on the wire first. > > Which packet does it choose to send first, and why? > > That's the question I'm looking for an answer to. > > If the answer has an RFC number, chapter and section, I'd be very happy. > If it doesn't - perhaps we have to invent one. > Or say that it's "implementation dependent". > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb
- [rtcweb] Some language on "prioritization" Harald Alvestrand
- Re: [rtcweb] Some language on "prioritization" Martin Thomson
- Re: [rtcweb] Some language on "prioritization" Michael Tuexen
- Re: [rtcweb] Some language on "prioritization" Harald Alvestrand
- Re: [rtcweb] Some language on "prioritization" Matthew Kaufman (SKYPE)
- Re: [rtcweb] Some language on "prioritization" Karl Stahl
- Re: [rtcweb] Some language on "prioritization" Michael Tuexen
- Re: [rtcweb] Some language on "prioritization" Harald Alvestrand
- Re: [rtcweb] Some language on "prioritization" Michael Tuexen
- Re: [rtcweb] Some language on "prioritization" Jeremy Laurenson (jlaurens)
- Re: [rtcweb] Some language on "prioritization" Michael Tuexen
- Re: [rtcweb] Some language on "prioritization" Harald Alvestrand
- Re: [rtcweb] Some language on "prioritization" Paul Kyzivat
- Re: [rtcweb] Some language on "prioritization" Karl Stahl
- Re: [rtcweb] Some language on "prioritization" Michael Tuexen
- Re: [rtcweb] Some language on "prioritization" Harald Alvestrand
- Re: [rtcweb] Some language on "prioritization" Karl Stahl
- Re: [rtcweb] Some language on "prioritization" Paul Kyzivat
- Re: [rtcweb] Some language on "prioritization" Karl Stahl
- Re: [rtcweb] Some language on "prioritization" Simon Perreault
- Re: [rtcweb] Some language on "prioritization" Paul Kyzivat
- Re: [rtcweb] Some language on "prioritization" Karl Stahl
- Re: [rtcweb] Some language on "prioritization" Karl Stahl