Hmm, on Intel it might be an SMI-Issue.

Matthias

On 08.01.2014 00:46, Pavel Vasilyev wrote:

08.01.2014 02:58, Tim Sander пишет:

quoted

Yeah 118 µs should be the right ballpark, while still a little high for my 
taste. All cortex a8 seem to have rather high latency. The A9's seem much 
better in this respect.

On my Intel Atom D425, latency around 25-30 µs (but peaks upto 5000 µs :/ )

quoted

Have you seen the following:
https://www.osadl.org/Realtime-Preempt-Kernel.kernel-rt.0.html#latencyfighting

Cyclictest has tracing support which might help finding the cause of the long 
latency. 

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