On Wed, Jan 11, 2023 at 11:05:48AM -0800, Tony Luck wrote: > > I wasn't sure if the few ms difference is going to make much material > > difference for that process. IPI's does shake things up and introduces > > other overheads not related to this process. > > Is it just a few milli-seconds? What is the scheduler priority of the kernel > thread you wake to perform this action? How does that compare to the > priority of a RT thread? I may be wrong here, but I think an RT thread can > block a kernel thread from running indefinitely. That's a good point. I don't have an idea about how the kernel thread priority is compared to user space RT threads. I assumed that since these threads have some work to be done from kernel, user space shouldn't get higher priority than kernel tasks. Uncharted territory for me ... Just a hunch :) Maybe @peterz can screw my head in the right direction :-)
