[Xenomai-help] Re: Latencies due to RT-Socket-CAN register accesses

[Wolfgang Grandegger <wg@domain.hid>]

Roland Tollenaar wrote:
> HI Wolfgang,
> 
>> It was the IXXAT PCI card currently plugged into my test PC but I 
>> actually recommand the PEAK PCI card. It's also much cheaper, I guess. 
>> Tomorrow I'm going to repeat the tests with this card ... stay tuned.
> Clear. Thanks for the advice.
> 
>>
>>> I will continue development on my laptop with the dongle for the time 
>>> being. It would be interesting to see what happens to the latency 
>>> after your proposed changes are in effect.
>>
>> BTW, what are the latencies you measure on your system under load 
>> (without RT-Socket-CAN).
> Off the top of my head 25us average 30us to 35us max. I am not sure I am 
> "loading" the system though. How do I measure this load that is always 
> talked about?

While the latency test is running execute in other windows:

- while ls; do ls; done
- ping -f <remote-host>"
- dd if=/dev/zero of=/dev/null

and let it run for a few hours. And also search the file TROUBLESHOOTING 
for "stress".

Wolfgang.