Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-16.txt
Colin Perkins <csp@csperkins.org> Mon, 13 June 2016 21:05 UTC
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From: Colin Perkins <csp@csperkins.org>
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Cc: "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-16.txt
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This version contains three sets of changes: - Editorial changes to the Abstract and Introduction, to address Stephen Farrell’s comment by clarifying what it means to “operate within the envelope defined by this memo". - Update Section 4.5 (“Ceasing Transmission”) to address Alissa Cooper’s DISCUSS, clarifying that it is the RTP flows sharing a 5-tuple that are stopped when the circuit breaker triggers, rather than the entire call. - Update Section 7 to address Mirja Mühlewind’s DISCUSS, expanding the discussion of how the RTP circuit breaker should react to ECN-CE marks. This changes “ECN-CE marked packets SHOULD be treated as if they were lost when calculating if the congestion-based RTP circuit breaker” into a more nuanced recommendation, based on likely future evolution of ECN response. This changes the normative requirements of the specification, so a brief new WG last call is likely needed. Cheers, Colin > On 13 Jun 2016, at 21:46, 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 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-16.txt > Pages : 26 > Date : 2016-06-13 > > 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 these applications, then network congestion can > lead to uncontrolled packet loss, and a resulting deterioration of > the user's multimedia experience. The congestion control algorithm > acts as a safety measure, stopping RTP flows from using excessive > resources, and protecting the network from overload. At the time of > this writing, however, while there are several proprietary solutions, > there is no standard algorithm for congestion control of interactive > RTP flows. > > This document does not propose a congestion control algorithm. It > instead defines a minimal set of RTP circuit breakers: conditions > under which an RTP sender needs to stop transmitting media data, to > protect the network from excessive congestion. It is expected that, > in the absence of long-lived excessive congestion, RTP applications > running on best-effort IP networks will be able to operate without > triggering these circuit breakers. To avoid triggering the RTP > circuit breaker, any standards-track congestion control algorithms > defined for RTP will need to operate within the envelope set by these > RTP circuit breaker algorithms. > > > 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: > https://tools.ietf.org/html/draft-ietf-avtcore-rtp-circuit-breakers-16 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-rtp-circuit-breakers-16 > > > 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/ > > _______________________________________________ > Audio/Video Transport Core Maintenance > avt@ietf.org > https://www.ietf.org/mailman/listinfo/avt -- Colin Perkins https://csperkins.org/
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-… Colin Perkins
- [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circ… internet-drafts