On Wed, Dec 13, 2017 at 1:35 PM, Alexander Graf <ag...@suse.de> wrote:

> Would it make sense to resort to polling at those speeds instead? Maybe
> poll using a constant reoccuring hrtimer?

Granted polling does not have the interrupt overhead. But I wonder how
it keeps up with respect to scheduling. Might one miss activity when
the kernel thread is not running?

> I also remember some talk about FIQ interrupts being faster than normal
> ones, but I never used them.

Same here. I would really like to try them! Here is some good information:

https://free-electrons.com/blog/fiq-handlers-in-the-arm-linux-kernel/

https://stackoverflow.com/questions/973933/what-is-the-difference-between-fiq-and-irq-interrupt-system


-- 
Roger Oberholtzer
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