Re: [Xenomai-help] parallelport module for measuring external interrupt latency

[Markus Franke <Markus.Franke@domain.hid>]

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Jan Kiszka wrote:
> 
> Even if the notification is not time-critical, you first have to get out
> of the Xenomai context in a sane manner. rtdm_nrtsig may help if you
> don't want to use the RT scheduler for user task wakeup.

OK. Thank you for the hint with rtdm_nrtsig_*. The kernel-module works now.

But I have still a problem when generating interrupts with a high
frequency, let's say 100us. Then I get large latencies in the range of
1,5 seconds. Can you see any reason for this. An intervall of 1ms works
without any problems and the latencies reach maybe 13us in worst case.

Thanks in advance,
Markus Franke

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