[ee122] MNL not simulating congestion correctly

Daniel Killebrew dank at berkeley.edu
Tue Nov 27 07:26:44 PST 2007

Eric Cheung wrote:
> We are doubling the RTO after every timeout and reducing the CWND. 
> However, we've run into a problem where MNL (with drop probability .25) 
> keeps dropping packets regardless of how slow we are sending, causing 
> our RTO to keep doubling.
Well of course, because it's a .25 probability independent of your send 
>   This seems to be counter-intuitive to the 
> behavior of an actual congested network, which would drop less packets 
> if a sender reduced its sending speed.  
Only if that particular sender was responsible for a significant share 
of the network's congestion. Obviously in reality you are not likely to 
be that significant (and I mean that in a nice way of course :) )
> Is this a fundamental problem 
> with the way MNL models the network or do we have to account for this 
> somehow?
As pointed out above, I wouldn't say that's a problem with MNL.

> Thanks
> - Eric
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