[R-C] A simple comment about draft-perkins-avtcore-rtp-circuit-breakers

[Michael Welzl]

So this is supposed to be for severe situations only, i.e. we want to  
avoid a false positive...

the draft says:

The congestion circuit breaker is therefore: when RTCP RR packets are  
received, estimate the TCP throughput using the above equation and the  
measured R, p (approximated by the loss fraction), and s. Compare this  
with the actual sending rate. If the actual sending rate has been more  
than an order of magnitude greater than the throughput equation  
estimate for two or more RTCP reporting intervals, stop transmitting.
(where "the above equation" is the TCP throughput equation)
but in the presentation today, a statement about reacting when you  
have reached 10 * that value was made. This means that the stream  
would stop sending when it's as aggressive as 10 TCP flows... on a  
host where there can easily be many more flows than that active in  
parallel with the RTP stream, I wouldn't judge that as a "circuit  
breaker" condition. My simple suggestion is to pick a much higher  
value, say 100?

Cheers,
Michael