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Is there any limitation of sched_deadline in rt-kernel under Ubuntu?

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I'm running an open source FFTW module in realtime kernel with schedule_deadline where I need a deadline of 0.5 ms. I noticed no difference in any behavior as specified by Ubuntu (image attached below).

1 . There are some peaks at beginning. What's the reason? 2 . "Ubuntu RT is deterministic" -> then why is it taking middle peaks? 3 . Will assigning the deadline takes some time, so only is that peak?

image_sched_deadline:

[image_sched_deadline][1

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