UDP vs. TCP distribution [was: Re: [e2e] Can feedback be generated...]

[David P. Reed]

At 09:12 AM 3/2/01 -0800, Sally Floyd wrote:
>I would be particularly interested if anyone's measurements ever
>indicated a surge of non-congestion-controlled traffic in the
>Internet...



Good idea, but I'd caution people to observe that non-TCP traffic is still 
capable of congestion control.  For example, one can do streaming media 
over UDP with congestion control - the same signals (lost packets, RED, and 
ECN) can be used to reflect congestion to the endpoints and implement a 
closed-loop adaptive solution (for video, lowering frame rate, and 
prioritizing audio, for example).

So the actual detection and measurement of "non-congestion-controlled" 
traffic flows is an end-to-end issue.  It isn't strictly observable at 
router, certainly not by just looking at protocol numbers.


- David
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