[e2e] Why do we need TCP flow control (rwnd)?

[Detlef Bosau]

David P. Reed wrote:
> Humans respond to the network getting slow by going to get coffee.   
> Mobs of humans acting independently also respond to slowness by *all* 
> getting coffee or doing something else.

So, is this more one of the exercises for a TOEFFL? (Example question: 
What's the meaning of "Mrs. Jones is out of coffee.") Or do we have a 
congestion problem at the coffee machine? And how should we implement a 
"packet drop" then?
>
> It's well known that before Superbowl commercials became more 
> interesting than the game, the plumbing systems of cities showed major 
> spikes of effluent highly correlated with commercial breaks.  :-)

O.k., this story circulated here for the little break at 8.15 pm after 
the evening news and the murder story on TV on sunday evening ;-)

>
> My general point was not against "random arrivals" but against the 
> assumption that those arrivals are independent of service rate changes.
>


Hm. The "randomness", which is offen assumed is exactly one of the 
problems in wireless networks and the expectation to find a formula 
which renders a "Bitrate" depending on a "SNR". Particularly noise is 
often highly correlated and symbol drops are anything but "random 
arrival on rare occasions".



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