Subject: Re: [xrblock] E-flag in xrblock-rtcp-xr-discard-rle-metrics

From: Colin Perkins <[email-masked]>
Date: Wed, 13 Jun 2012 17:06:10 +0200

Hi,

This seems reasonable. Increasing the number of different cases that can be reported on also increases the number of report blocks that may need to be sent to cover all cases, and the cost of doing that would seem to outweigh the benefit.

Colin

On 31 May 2012, at 15:11, Varun Singh wrote:
> Hi all,
> 
> There were a few emails exchanged on the mailing list with regards to
> the E-flag (for early and late discards). The discard-03 draft expands
> the E-bit from 1-bit to 2-bits, which now expresses different reasons
> for discards (misc, early, late, cumulative).
> 
> Discarded bytes can be used by the RTP sender to observe overuse or
> underuse and react accordingly.
> Similarly the discarded RLE shows which packets were discarded and
> more importantly the pattern of discards (towards the beginning or
> later in the reported interval). For example: the RTP sender can
> overlay the discard RLE and loss RLE and observe if the losses
> occurred after discards.
> 
> The discard-RLE draft already provides a brief guideline on when to
> use the different discard reports. We can clarify there that the
> discard RLE and bytes should be used where precision is required else
> use the discarded packets report (which gives more range of discard
> types).
> 
> Therefore, I do not think this expansion is required for the discarded
> bytes or Discard RLE and a single bit identifying discard due to late
> and early should be sufficient.
> 
> Comments?
> 
> Cheers,
> Varun
> 
> On Thu, May 31, 2012 at 10:43 AM, Shida Schubert <[email-masked]> wrote:
>> 
>> This is an announcement of a 2 weeks XRBLOCK WG last call on
>> "Report Block for Run Length Encodings of Discarded Packets" prior
>> to requesting publication of the document as a proposed standard.
>> 
>> Please send your comments, including nits, to the list by the
>> 
>>  14th of June
>> 
>> If you read the draft and you see no issues, concerns, or nits, please
>> express the fact that you have no issue progressing the draft on the
>> list as well.
>> 
>> The latest version can be found here:
>> 
>>  http://tools.ietf.org/html/draft-ietf-xrblock-rtcp-xr-discard-rle-metrics-03
>> 
>> Regards
>> 
>> Shida as co-chair
>> _______________________________________________
>> xrblock mailing list
>> [email-masked]
>> https://www.ietf.org/mailman/listinfo/xrblock
> 
> 
> 
> -- 
> http://www.netlab.tkk.fi/~varun/
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-- 
Colin Perkins
http://csperkins.org/