Re: [LARTC] scheduler testing

[Amit Kucheria <amitk@ittc.ku.edu>]

On Fri, 7 Dec 2001, Amit Kucheria wrote:

Hi all,
 
I am currently trying to test the schedulers available in Linux - CBQ, 
FIFO, PRIO, SFQ and WRR.
 
My setup is simple -

          10Mbit           10Mbit
  Source --------- Router --------- Sink
                eth0   eth1
 

- I need to simulate the 'router-sink' link at a T1 link. obviously the 
best way to do this is to but a TBF on eth1.

But i want to test various kinds of queueing disciplines with this rate 
limited traffic. This wont be allowed by TBF which cant take classes.

So would the following work ?

                    1Mbit
TBF qdisc 2:0     +--------+    *******     My various classes FIFO, CBQ
CBQ class 1:1    +----------+  +--------+   CBQ class 1:2
                +-------------------------+  CBQ qdisc 1:0


Now TBF rate limits to 1Mbit and then a filter filters the packet to "my 
various classes which could be multiple CBQ, prio classes or simple fifo.

 - I am generating average traffic of 1Mbps at the source
 - I need a rate-limiting architecture which will allow be to test various 
   schedulers as well as impose a strict limit on the outgoing link.

Regards,
Amit

-- 
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                  Amit Kucheria
          EECS Grad. Research Assistant
         University of Kansas @ Lawrence
   (R)+1-(785)-830 8521 ||| (O)+1-(785)-864 7774
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