* [LARTC] measuring queueing delay using iproute2
@ 2002-02-27 1:02 Radhakrishnan Vijay
2002-02-27 7:55 ` bert hubert
2002-02-27 8:55 ` Martin Devera
0 siblings, 2 replies; 3+ messages in thread
From: Radhakrishnan Vijay @ 2002-02-27 1:02 UTC (permalink / raw)
To: lartc
I am using the tc functionality provided by iproute2
to setup classes and queueing disciplines. I have a
requirement to determine the queueing delay of each
packet belonging to a particular class so that i can
measure the average queueing delay over a time
interval for a particular traffic class. I would be
grateful if somebody could give me pointers on how i
possibly can achieve this. I suspect that i would have
to modify the source code of iproute2 , but am not too
sure on what segment of the code i should be
modifying.
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* Re: [LARTC] measuring queueing delay using iproute2
2002-02-27 1:02 [LARTC] measuring queueing delay using iproute2 Radhakrishnan Vijay
@ 2002-02-27 7:55 ` bert hubert
2002-02-27 8:55 ` Martin Devera
1 sibling, 0 replies; 3+ messages in thread
From: bert hubert @ 2002-02-27 7:55 UTC (permalink / raw)
To: lartc
On Tue, Feb 26, 2002 at 05:02:45PM -0800, Radhakrishnan Vijay wrote:
> I am using the tc functionality provided by iproute2
> to setup classes and queueing disciplines. I have a
> requirement to determine the queueing delay of each
> packet belonging to a particular class so that i can
> measure the average queueing delay over a time
> interval for a particular traffic class. I would be
> grateful if somebody could give me pointers on how i
> possibly can achieve this. I suspect that i would have
> to modify the source code of iproute2 , but am not too
> sure on what segment of the code i should be
> modifying.
Right now the actual delay is not measured by the kernel, so I don't see how
you would get at it. You could calculate the effective class bandwidth and
multiply that by the average qlength, but that would be pretty indirect.
Regards,
bert
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* Re: [LARTC] measuring queueing delay using iproute2
2002-02-27 1:02 [LARTC] measuring queueing delay using iproute2 Radhakrishnan Vijay
2002-02-27 7:55 ` bert hubert
@ 2002-02-27 8:55 ` Martin Devera
1 sibling, 0 replies; 3+ messages in thread
From: Martin Devera @ 2002-02-27 8:55 UTC (permalink / raw)
To: lartc
you have to modify kernel code ;) Add one field into
sk_buff and initialize it with TSC at recieve. Then
in global dequeue in sch_generic.c IIRC you can
compute delay and either prinkt or average it directly
in kernel.
devik
On Tue, 26 Feb 2002, Radhakrishnan Vijay wrote:
> I am using the tc functionality provided by iproute2
> to setup classes and queueing disciplines. I have a
> requirement to determine the queueing delay of each
> packet belonging to a particular class so that i can
> measure the average queueing delay over a time
> interval for a particular traffic class. I would be
> grateful if somebody could give me pointers on how i
> possibly can achieve this. I suspect that i would have
> to modify the source code of iproute2 , but am not too
> sure on what segment of the code i should be
> modifying.
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2002-02-27 1:02 [LARTC] measuring queueing delay using iproute2 Radhakrishnan Vijay
2002-02-27 7:55 ` bert hubert
2002-02-27 8:55 ` Martin Devera
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