[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.
---
Alex
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
>
> TUN
>
>
>
>
>
>
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