Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-09.txt

[Colin Perkins <[e-mail]>]

Magnus,

On 11 Mar 2015, at 10:50, Magnus Westerlund <[e-mail]> wrote:
> 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.

Copy-paste bugs. Will fix.

> 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).

Makes sense.

Cheers,
Colin




> 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, [e-mail] 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/
>> 
>> _______________________________________________
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>> 
>> 
> 
> 
> -- 
> 
> Magnus Westerlund
> 
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-- 
Colin Perkins
https://csperkins.org/