a good way to measure latency of interuptions

[Julien Michel]

Hi all,
I am running a v24.1.11 RTAI version on an embedded system.

I would like to measure the latency time to start an interruption routine.
By latency time, I mean the delay between the time a hardware interruption
appears and the time its corresponding routine starts.

I heard the average maximum latency time is about 10-20 us, depending on the
system load, the runtime frequency etc...

Is there any way to accurately do such a measurement ?


Btw, I try to measure the delay to execute a routine.
I use the do_gettimeofday function, one at the beginning, one at the end, of the
routine and get the difference.
I wonder if it is a good way. Indeed, an interruption of a higher priority may
occur between the do_gettimeofday functions, so the measures would be wrong ...

Thanks to all


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