Testing Congestion Control Algorithms

[hiren panchasara]

On 04/23/15 at 10:17P, Karlis Laivins wrote:
> Hi,
> 
> I am currently working on a modification of TCP NewReno congestion control
> algorithm. It seems that I have been able to write a working module.
> 
> Now, I am looking for a way to test the performance of the built-in
> congestion control algorithms and the new algorithm. I have heard about the
> NS-2 simulator, and I am trying to compile and configure it now, but that's
> just a statistical tool (from what I hear) and the results are far from
> reality (please correct me, if I am wrong).
> 
> Please recommend a tool or way I can test the performance of the congestion
> control algorithm in a "real" environment (sender side - 2 Computers, one
> connected to the wireless network, other to a wire, receiver - one PC,
> running FTP server, both senders each sending a big file at the same time).
> I would like to get comparable performance results from each of the
> existing congestion control algorithm as well as the new one I have created
> by modifying the NewReno algorithm.

Comparing performance of different cc algorithms might be tricky as they
are designed with different goals in mind.
I suggest you stick with your modified newreno vs original newreno and see if
your modifications are letting you do whatever that you have decided.

You may want to look at dummynet(4). This can be a useful read
http://info.iet.unipi.it/~luigi/papers/20091201-dummynet.pdf

siftr(4) is a handy tool to have around to make sure your congestion
control module is behaving the way you want.

cheers,
Hiren
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