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Re: [ns] werid delay between enqueue and dequeue
If you don't want ANY queueing delay, use session sim, it'll save you
memory and runtime as well. Just say [new SessionSim]
FYI.
On Thu, 6 Jul 2000, Bo Wen wrote:
> Date: Thu, 06 Jul 2000 15:42:33 -0700
> From: Bo Wen <[email protected]>
> To: [email protected]
> Subject: Re: [ns] werid delay between enqueue and dequeue
>
> Ok, thanks for your hints. I figured out the problem. In order to remove the
> queue delay
> to simulate circuit switching, I just simply replaced "queue" object with
> "connector",
> and disable delaylink to schedule the next dequeue time.
> //s.schedule(h, &intr_, txt);
> Then, each packet's enqueue and dequeue (they shouldn't exist) time are exactly
> same.
>
> Bo
>
> Tarik Alj wrote:
>
> > Bo,
> >
> > >Date: Thu, 6 Jul 2000 19:25:05 +0100 (BST)
> > >From: Lloyd Wood <[email protected]>
> > >X-Sender: [email protected]
> > >To: Bo Wen <[email protected]>
> > >cc: Tarik Alj <[email protected]>, [email protected]
> > >Subject: Re: [ns] werid delay between enqueue and dequeue
> > >X-url: http://www.ee.surrey.ac.uk/Personal/L.Wood/
> > >X-no-archive: yes
> > >MIME-Version: 1.0
> > >
> > >On Thu, 6 Jul 2000, Bo Wen wrote:
> > >
> > >> Thanks for your hints. But I checked out the queue code, that it seems there
> > is
> > >> no scheduled time related code. You know, ns uses the relative time, so how
> > >> is this delay implemented? Since I am simulating the circuit switching,which
> > >> assumes that there is no extra delay on the link except the link propagation
> > >> delay,
> > >> How can I remove this sort of queuing delay?
> >
> > what do you mean by "scheduled time"? Queueing delay is not a fixed or
> > scheduled, it only depends on the number of packets present in the queue when a
> > packet arrives. If you don't want to have any delay at all, set the queue size
> > to 1 packet. But then expect some drops where you had delay...
> >
> > >
> > >Do you have different link bandwidths?
> >
> > if circuit switching I assume the network is properly dimensionned... so there
> > should be no bottle-necks, therefore minimum drops. But why would different link
> > bandwidth would pose a problem?
> >
> > >
> > >L.
> > >
> > ><[email protected]>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
> >
> > Tarik
>
>