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Re: [rtcweb] Target numbers for setup time (Re: Keeping up data channel)

Salvatore Loreto <salvatore.loreto@ericsson.com> Fri, 29 June 2012 10:56 UTC

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Date: Fri, 29 Jun 2012 13:56:45 +0300
From: Salvatore Loreto <salvatore.loreto@ericsson.com>
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Subject: Re: [rtcweb] Target numbers for setup time (Re: Keeping up data channel)
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as I said during the interim
we can reduce the 3 way handshake in the channel setup, but at cost of 
complicate "a little" the data framing


On 6/28/12 10:49 PM, Cullen Jennings (fluffy) wrote:
> Agree - that's why I think this has to be done in zero RTT. I don't see any problem with setting up a data channel and being ready to send media before having the UI tell the user they are "connected and can start talking".
>
> Reducing from 7 RTT to 5 RTT does not help when you need to get to 0 RTT.
>
> On Jun 22, 2012, at 10:09 , Harald Alvestrand wrote:
>
>> On 06/22/2012 05:58 PM, Cullen Jennings (fluffy) wrote:
>>> On Jun 13, 2012, at 5:29 , Randell Jesup wrote:
>>>
>>>>> How far down do you think we have to drive the setup time before you
>>>>> would not call it "abysmal"?
>>> I'd probably consider above 250 ms abysmal but good news I don't see any problem with getting it down around 100 ms in when both endpoints are in a single country.
>>>
>> Coast-to-coast US is ~4800 km, so RTT (9600 km) is 32 ms (speed of light is 300 km/msec).
>>
>> So, without considering processing time, 3 RTT is 100 msec, 7 RTT is "abysmal".
>>
>> There are bigger countries than the US, but this will do for a back-of-the-envelope.
>>
>>
>>
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