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Re: [MMUSIC] Updating the pacing of ICE connectivity checks

"Pal Martinsen (palmarti)" <palmarti@cisco.com> Fri, 15 February 2013 18:43 UTC

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From: "Pal Martinsen (palmarti)" <palmarti@cisco.com>
To: Emil Ivov <emcho@jitsi.org>
Thread-Topic: [MMUSIC] Updating the pacing of ICE connectivity checks
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Date: Fri, 15 Feb 2013 18:43:09 +0000
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, Ari Keränen <ari.keranen@ericsson.com>, Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>, "Dan Wing (dwing)" <dwing@cisco.com>, mmusic <mmusic@ietf.org>
Subject: Re: [MMUSIC] Updating the pacing of ICE connectivity checks
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On Feb 15, 2013, at 18:16 PM, Emil Ivov <emcho@jitsi.org>
 wrote:

> Well for one, we hadn't even noticed that there was different pacing for
> non-RTP traffic, so when we added support for Pseudo TCP to ice4j.org,
> we just let it use the default timers. It really didn't cross our
> collective minds that the same stack in the same application would have
> the right of going down to 20ms if it used the magic word (and RTP
> header) but then go back up to 500 ms if it didn't. It's almost as if it
> were punished for having bad non-RTP thoughts ;)
> 
Ha,ha. For us it was opposite. Never noticed the non-RTP stream limitation...

> Anyways, I think that, had we known about the "MUST NOT drop below 500
> ms" limitation, we would have simply ignored it: these are user
> perceptible delays after all, and no one would like to wayt 10+ seconds
> for a file to start transferring.
> 

On a side note I think simpler is better. Choosing a 20ms timer (or any value) is better than calculating something from what bandwidth you are using. It is hard to say what bandwidth a H.264 encoder is going to use, depends on how much movement in the picture and so on.

.-.
Pål-Erik

> Cheers,
> Emil
> 
> On 15.02.13, 17:47, Gonzalo Camarillo wrote:
>> Hi,
>> 
>> to add to what Magnus said, it is important that we understand what
>> implementations have been doing so far (regardless of what the RFC says)
>> and that we come up with recommendations implementers will actually
>> follow. Keep in mind we are here to write specifications, not fiction ;-)
>> 
>> Thanks,
>> 
>> Gonzalo
>> 
>> 
>> On 14/02/2013 5:51 PM, Magnus Westerlund wrote:
>>> Thus I would be careful with speeding up Ta for RTP to much, and I think
>>> someone needs to fine empiric data that it would work.
>>> 
>>> For the the 500 ms that can likely be significantly lowered without any
>>> issues. But some considerations around the wider usage needs to be taken
>>> into account.
>> 
>> 
> 
> -- 
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