[ndnSIM] ConsumerWindow and Congestion

Alex Afanasyev alexander.afanasyev at ucla.edu
Thu Jul 18 08:34:53 PDT 2013

Hi Tun,

The behavior you're observing is probably not wrong, it just that ConsumerWindow is not equal to TCP.  ConsumerWindow has very simplistic congestion-related logic implemented, so it causes such an oscillations and weirdnesses.  You may want to consider implementing a more aggressive and more TCP-like consumer, or you can also enable NACKs (EnableNACKs parameter for the forwarding strategy), which may improve (but probably not going to completely solve) your problem.


On Jul 17, 2013, at 8:07 AM, Tun Tun Oo <htunhtunu at gmail.com> wrote:

> Dear Alex
> I did an experiment using the 8-node bottleneck scenario with ConsumerWindows application. As topology, I arranged as similar to the 6-node bottleneck scenario.
> C1\                                                        /P1
>      \                                                    /
>      /-------R1---------R2---------R3-------R4 \
>    /                                                     \ 
> C2                                                        P2
> All the access link are 10 Mbps/10 ms  and all routers are 1 Mpbs/10 ms.
> I set the Size Attribute of ConsumerWindow as 2 Mbyte and other setting as default.
> I found the some strange behaviors from graph-output
>  First 3 sec simulation two consumers are working as usual.
> Next 20 sec only one consumer (c1)can send and receive.
> After 20 sec two consumers can send and receive.
> From 23 sec to end of simulation (40 sec) only one consumer (c2) is sending and receiving.
> I would like to know your advice of what  is wrong in this experiment?
> Thanks in advance.
> Regards
> _______________________________________________
> ndnSIM mailing list
> ndnSIM at lists.cs.ucla.edu
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