Real-time benchmark between preempt_rt, Xenomai and RTAI

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I need to compare performance between the preempt_rt patches, Xenomai and RTAI. They each have their own benchmarks but they don't give similar results and not all benchmarks are available in all three platforms. What I'm looking for is a benchmark that will measure basic performance, like interrupt latency, context switch time, etc and that will run on all three platforms. I tried implementing the a Thread-Metric benchmark, but it was too complicated for me. Anyone knows if such a benchmark exists? Thanks in advance for any help.

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