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Re: [AVTCORE] Notes on RTP CC Feedback from the Hackathon

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Tue, 26 March 2019 09:32 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Jonathan Lennox <jonathan@vidyo.com>
CC: IETF AVTCore WG <avt@ietf.org>, "rmcat@ietf.org" <rmcat@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [AVTCORE] Notes on RTP CC Feedback from the Hackathon
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Date: Tue, 26 Mar 2019 09:32:05 +0000
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Subject: Re: [AVTCORE] Notes on RTP CC Feedback from the Hackathon
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OK, then I get it, thanks.

/Ingemar

> -----Original Message-----
> From: Jonathan Lennox <jonathan@vidyo.com>
> Sent: den 26 mars 2019 10:29
> To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
> Cc: IETF AVTCore WG <avt@ietf.org>; rmcat@ietf.org
> Subject: Re: [AVTCORE] Notes on RTP CC Feedback from the Hackathon
> 
> 
> 
> > On Mar 26, 2019, at 10:15 AM, Ingemar Johansson S
> <ingemar.s.johansson@ericsson.com> wrote:
> >
> >
> >>
> >> The question here is about maintaining *local* data (internal to the
> >> sender’s data structures) remembering the a total order of the
> >> packets sent across all SSRCs, for congestion control algorithms that
> >> want to treat data sent as a single aggregate, rather than treating SSRCs
> independently.
> > [IJ] Ok, I guess that should be doable if you keep a list of transmitted packets
> and the time when they have been transmitted, already available in the SCReAM
> code but it would take some sorting to get the transmission order, not sure
> though what one can use this piece of information for ?
> 
> If SCReAM doesn’t need this, that’s fine; it doesn’t need to maintain it.
> 
> Other algorithms may need it, however.  In particular, GCC wants packet
> sequence numbers (or at least the GCC API in libwebrtc does), which is where we
> ran into the issue.

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