Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-09.txt
Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 11 March 2015 15:50 UTC
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Date: Wed, 11 Mar 2015 16:50:09 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: IETF AVTCore WG <avt@ietf.org>, draft-ietf-avtcore-rtp-circuit-breakers@tools.ietf.org
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-09.txt
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WG, I have reviewed the changes in this version and like to thank the authors for the proposal on scaling the reporting interval. I do however have some feedback. 1. Section 4.5: The table contains two errors. A. The CB_interval for Td=5.0 should be 3. B. All values in the Time to trigger for Td values from 1.0 seconds and larger is calculated without using the floor function. 2. Section 4.5: If the RTP/AVPF profile [RFC4585] or the RTP/SAVPF [RFC5124] is used, and the T_rr_interval parameter is used to reduce the frequency of regular RTCP reports, then the value Td in the above expression for the CB_INTERVAL parameter MUST be replaced by T_rr_interval. I think that the correct thing to do is to say that for AVPF/SAVPF the calculation of the CB_Interval shall be done using max(T_rr_interval, Td). I do hope that other WG participants will review this. The change with scaling the triggering is a significant change and you should evaluate it. Cheers Magnus Westerlund (As individual) On 2015-03-06 17:54, internet-drafts@ietf.org wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Audio/Video Transport Core Maintenance Working Group of the IETF. > > Title : Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions > Authors : Colin Perkins > Varun Singh > Filename : draft-ietf-avtcore-rtp-circuit-breakers-09.txt > Pages : 22 > Date : 2015-03-06 > > Abstract: > The Real-time Transport Protocol (RTP) is widely used in telephony, > video conferencing, and telepresence applications. Such applications > are often run on best-effort UDP/IP networks. If congestion control > is not implemented in the applications, then network congestion will > deteriorate the user's multimedia experience. This document does not > propose a congestion control algorithm; instead, it defines a minimal > set of RTP "circuit-breakers". Circuit-breakers are conditions under > which an RTP sender needs to stop transmitting media data in order to > protect the network from excessive congestion. It is expected that, > in the absence of severe congestion, all RTP applications running on > best-effort IP networks will be able to run without triggering these > circuit breakers. Any future RTP congestion control specification > will be expected to operate within the constraints defined by these > circuit breakers. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-avtcore-rtp-circuit-breakers/ > > There's also a htmlized version available at: > http://tools.ietf.org/html/draft-ietf-avtcore-rtp-circuit-breakers-09 > > A diff from the previous version is available at: > http://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-rtp-circuit-breakers-09 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > -- Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-… Colin Perkins
- [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circ… internet-drafts
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-… Magnus Westerlund