Imre Paniti wrote:
> 2006/8/14, Jan Kiszka <[EMAIL PROTECTED]>:
>>
>> Imre Paniti wrote:
>> > We want to test our RTnet aplication to see if the timing is right.
>>
>> What timing? On the cable?
>
>
> The time difference between sending and reciving.
>
>> Actually we find a page for Active Probing at
>> > http://www.cubinlab.ee.unimelb.edu.au/probing/software.php#tsc-rt-linux
>> > but they dealing with RTnet based on RTLinux.
>> > Our environment: 2 PC with 2.6.15 kernel, RTAI-3.3-cv and RTnet 0.9.3
>> > The NICs are RT8139.
>> >
>> > Do you have some suggestions for us?
>>
>> Do you have a chance to attach a third station as a sniffer to your
>> network (works best with one of the rare 100 MBit hubs...)? Then
>> grabbing the traffic with RTnet+RTcap on that box would give you a good
>> impression with accurate timestamps (in the order of IRQ latencies).
>>
>> Jan
>
>
> Thanks for the idea!
> We can do that, but what about using RTnet+RTcap (+Ethereal as a capturing
> tool) on those PCs without a third station?
Also feasible. You just have different clocks then. And you see things
like the stations see them. If you plan to load the boxes in order to
generate worst case behaviour, your locally taken timestamps will suffer
as well. Therefore the idea of a third station dedicated to measuring.
Jan
I think I get it - with a third station we can measure the performance of RTnet under high pressure, sending loads of data with a static interval and see how much this interval differs from the interval with which our sniffer sees a packet. Is that right? If it is, that is not really what we're looking for. We're trying to find a way to see how RTnet affects our real-time thread - while sending much data and little data, and with a busy thread and a less busy thread. If possible, then how would a third machine sniffer deal with that? Or would there be an other solution?
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