[Click] notifier queues and UDP traffic

[Nicola Arnoldi]

Hi all.
I am noticing a strange behavior of UDP CBR flows.
I am measuring some delay/jitter figures and the following happens.

If I inject in a notifierqueue a low packet rate flow, and on another  
queue a TCP in-saturation flow (scheduled by a RR element) the delays  
are higher than if I inject multiple UDP CBR flows. From the queue's  
point of view it is a UDP CBR flow with increased packet rate.
The queues are 50 pkt long and the UDP throughput of the flows is 8  
kbps.

Is it possible that the sleeping mechanism, which is a sort of  
hysteresis of the empty-queue notifier, has an influence on it?
I mean, with low rates, the queue becomes empty a lot of times and  
that hysteresis happens a lot of times?

I tried changing the SLEEPINESS parameter in the queue code from 9 to  
3, but doesn't seem to solve the problem.

Any ideas?

Nicola

Il giorno 06/mar/07, alle ore 15:07, Li, W David ha scritto:

> Hi,
>
> I am new to Click. To get me started I have a few beginner's  
> questions:
>
>
>
> 1. Is there a Click based wireless LAN router (802.11)  
> implementation? I
> am especially interested in the Mac code.
>
>
>
> 2. Is it possible to run several Click instances in a single Linux  
> box?
>
>
>
> Thanks.
>
>
>
>
>
> W. David Li
>
>
>
>
>
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