[LARTC] Re: traffic generator

[LARTC] Re: traffic generator

[Martin Devera]

> But you did, and I downloaded it, and I want to use it ;-)

hehe it is probably the worst program I've written ..
but works well
 
> > it reads generator program from stdin, executes is and it
> > writes results to stdout.
> > see demo program at my web.
> Whatever I try, I get an error (compiled with cc eherloop.sh) :
> 
> a.out: ethloop.c:231: main: Assertion `sock>0' failed.

well, it sends data to raw device (set in control script)
and recieves them from all interfaces. The flow is NOT ip.
It is special flow.
Simulator uses skb->priority to direct messages into classes
(you don't have to have filters attached). See this simple script:

0       i       0       eth0
0       i       1       eth0
0       P       0       0x10002
0       P       1       0x10003
0       R       0       90000
1000	R	1	80000

It confugures two flows, flow 0 goes to eth0 and classid 1:2
at rate 90kbps. Flow 1 again eth0, class 1:3 starts at time 1000ms
at rate 80kbps.

You store this into file prog and run ./ethloop < prog.

That's all. It will emit results at stdout (for step 0.5sec,
input and output rate plus two delays).

You need either two ethernet cards connected into your
computer (and connected via cross-cable) or even single
card with loop connector inserted (single RJ connector
with rx-tx pair interconnected by short piece of wire).

another question ?
:)
devik



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