Hello,

I wonder if using a periodic alarm with the rt_alarm_wait() function can suffer from drift in alarm expiration times when a kernel module or an ISR remains in a non-preemptible section for too long (upto 1 msec). Please note that I'm concerned with alarm expiration time drift not overruns. How does the behavior change when the task is declared periodic and triggered with rt_task_wait_period() ?


I'm using Xenomai 2.4.5 w/ kernel 2.6.27.10.

best regards,

--
alphan

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