Interrupt Bottom Half Scheduling

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How is the scheduling of the hrtimers softirq thread handled?

When querying the RT priority of the hrtimer softirq, I get a priority
of 50.  But when running a priority 99 thread, we still seem to be
getting interrupted.  Shouldn't the hrtimer softirq be put off until
the CPU is idle or a lower priority task is running?

Thanks,
Pete
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