[e2e] Re: queue averaging introduces delay

[Wu-chang Feng]

 From queuing theory, only when the sources have a Poisson arrival rate 
does the length of the queue directly relate to the number of sources 
(and thus the appropriate congestion response).

Both the TCP request arrival rate and the inter-packet arrival rate of a 
single TCP connection are decidedly non-Poisson.  This makes placing 
queue length (and especially instantaneous queue length) at the heart of 
AQM schemes dubious.  

Decoupling queue length from AQM schemes can provide significant 
improvements in packet loss, queuing delay, and link utilization.  If 
you try setting w_q in RED to something extremely small or try using 
Blue QM, you can see this difference directly.....

Wu