Tick interrupt priority?

[groups at chichak.ca]

I was reviewing the interrupt priorities on a project where I’m using FreeRTOS and they want the tick interrupt priority to be very low.

I found this to be not obvious, then started wondering what the elders of the RTEMS suggest for use with RTEMS.

Should the tick interrupt be high priority or low?

Enquiring minds want to know.

Thanks, 
Andrei