Comment by jovial_cavalier

A few months ago, I played around with a contemporary build of preempt_rt to see if it was at the point where I could replace xenomai. My requirement is to be able to wake up on a timer with an interval of less than 350 us and do some work with low jitter. I wrote a simple task that just woke up every 350us and wrote down the time. It managed to do it once every 700us.

I don't believe they've actually made the kernel completely preemptive, though others can correct me. This means that you cannot achieve the same realtime performance with this as you could with a mesa kernel like xenomai.