Re: [AVT] Maximum rate with TFRC

[Ladan Gharai <[e-mail]>]

Alejandro:

The senders data rate is also limited by x_recv - and will not at any  
point be increased by more that 2*x_recv:

 From RFC 3448 (section 4.3):

    4) Update the sending rate as follows:

          If (p > 0)
              Calculate X_calc using the TCP throughput equation.
              X = max(min(X_calc, 2*X_recv), s/t_mbi);
          Else
              If (t_now - tld >= R)
                  X = max(min(2*X, 2*X_recv), s/R);
                  tld = t_now;

In absence of packet loss, a limited receiver and say your using a  
10G NIC then your limit would be the applications data rate, once  
your at steady state. I hope to test this scenario soon.

Ladan


On Aug 12, 2005, at 11:16 AM, Alejandro Cabrera Obed wrote:

> Dear people,
>
> Suposse I have an application that transmit, let's say, at 1 Gbps.
> Suppose I apply TFRC in order to control the congestion.
>
> Can you explain to me how TFRC affects the maximum rate ??? Because if
> I follow the formula, in absence of packet loss it's p = 0 and the
> throughput will get high and high......(near infinite rate).
>
> Or the maximum rate in absence of packet loss is always the throughput
> of the application, in my example 1 Gbps ???
>
> I need your help please........
>
> Thanks and greetings !!!!
>
> Alejandro
>
> -- 
> Alejandro Cabrera Obed
> [e-mail]
>
> _______________________________________________
> Audio/Video Transport Working Group
> [e-mail]
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>


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