Re: [ns] Strange DiffServ Result.

[Xuan Chen <xuanc@ISI.EDU>]

On Mon, 16 Jul 2001, Sergio Andreozzi wrote:

> in method dsREDQueue::reset() there is the following code
>
> 	for (i = 0; i < MAX_QUEUES; i++)
> 		redq_[i].qlim = limit();
>
> This is a method defined also in Queue class from which dsREDQueue descend.
> Probably some function call it and reset the queue limit.
> Just move it in the dsREDQueue constructor and check what happens.
>
> Can anyone explain me when the reset method is called?
in the constructor...

>
> Thanks
>
>
> Sergio
> ..............................................
>
> Sergio Andreozzi
>
> email: sergio.andreozzi@lut.fi
>
>
>
>
> -----------------------------------------
> Hi.
> I tried to simulate DiffServ( Nortel's ) with different queue sizes
> for different queues so that I modified dsred.cc and .h.
> I simply added a dsREDQueue::command that receive queue size and
> assigned the values to redq_[i].qlim.
> I simulated an example script in /tcl/ex/diffserv/ds-cbr-tb-WRR.tcl.
> Originally, the queue size is fixed with 50. There are 2 udp flows so
> that there are 2 physical queues in core router.
> I changed one of them into 100.
>
> I only expected the change in result that I changed the queue size.
> However, the number of packet dropped is also decreased in the the
> other queue.( still the queue size is 50 ). The scheduler used is
> WRR with 3,7 for each class.( I changed queue size for 3 )
> Did I miss anything???
>
> Any advice will be appreciated.
>
> Best regards.
> Sungwon.
>
> ======================================
> Yi, Sungwon
> Have a wonderful day!
> ======================================
>
>

-- 
Xuan Chen
USC/ISI