Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt

Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 20 October 2015 11:08 UTC

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To: Colin Perkins <csp@csperkins.org>, "avt@ietf.org WG" <avt@ietf.org>
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Date: Tue, 20 Oct 2015 13:08:48 +0200
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt
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WG,

I want to stress that I personally think this looks pretty well baked 
and my high level issues are resolved. I also think what is in this 
document is actually implementable, however that is without having 
implemented.

I really want to encourage that you review this now!

Cheers

Magnus Westerlund
AVTCORE chair


Den 2015-10-19 kl. 12:17, skrev Colin Perkins:
>> On 16 Oct 2015, at 17:30, 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-11.txt
>> 	Pages           : 23
>> 	Date            : 2015-10-16
>>
>> 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:
>> https://tools.ietf.org/html/draft-ietf-avtcore-rtp-circuit-breakers-11
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-rtp-circuit-breakers-11
>
> This version of the draft is a major update, that makes the following changes:
>
> - Update the media timeout circuit breaker to address the over- and under-sampling issues raised by Magnus Westerlund, by taking into account the RTT and RTP framing interval in the calculation, as well as the RTCP reporting interval.
>
> - Update the congestion circuit breaker to address the over- and under-sampling issues raised by Magnus Westerlund, and to account for codecs that cannot change their rate on each frame, by modifying the definition of CB_INTERVAL to include the RTP framing interval, the frame group size, and the RTT in the calculation, as well as the RTCP reporting interval.
>
> - Collect definitions and clarify terminology.
>
> - Clarify behaviour when interworking with systems that don’t implement RTCP, based on feedback by Simon Perreault.
>
> - Remove discussion on Impact of RTCP Reporting Groups, that seemed to confuse rather than clarify.
>
> - Various editorial fixes to address other review comments by Simon Perreault, and make assorted other corrections.
>
> Feedback welcome.
>
> Colin
>
>
>
>


-- 

Magnus Westerlund

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