Eduardo, it could be a synchronization issue. Try to avoid synchronization between flows by setting the random flag of the cbr flows to true: "$cbr_name set random_ 1".
Regards, Marco Fiore >---- Messaggio originale---- >Da: [EMAIL PROTECTED] >Data: 7-giu-2006 3.00 PM >A: <ns-users@ISI.EDU> >Ogg: [ns] two equal UDP CBR flows in droptail queue get different bandwidths? > > >Hi there: > >I've set up this experiment. I have two source nodes S1 and S2 directly >connected to a node R1 and two destination nodes D1 and D2 also directly >connected to a node R2. Nodes R1 and R2 are connected. All links are 1 Mb/s >Full duplex with DropTail. Now, here's the thing. I set up two flows, one >going from S1 to D1 and the other one form S2 to D2. Both flows are UDP CBR 1 >Mb/s. Flow 1 starts at t=0 and finishes at t=20. flow 2 starts at t=10 and >stops at t=15. Sim runs from t=0 to t=25. > >I'd expect that at t=10 (when flow 2 starts), both flows would experience the >same amount of packet losses, so that each one would use about 0.5Mb/s of the >link between R1 and R2. But what really happens is that from t=10 to t=15, >flow 2 uses all bandwidth while flow 1 loses all packets. Since both flows >have the same parameters, shouldn't they receive the same share of bandwidth >during that period? Or am i missing something here? > >Thanks in advance. > >-- >Eduardo J. Ortega - Linux user #222873 >"No fake - I'm a big fan of konqueror, and I use it for everything." -- Linus >Torvalds > >
