We have written a minimal kernel interrupt handler for the Raspberry
Pi 3. It is running the current 64-bit Tumbleweed kernel. I am curious
about the rate of interrupts that we might be able to capture.
The ISR does little other than run when a raising edge interrupt
happens. We are looking at /proc/interrupts to see how many interrupts
We see that at around 23 kHz we begin to loose interrupts. The system
is not doing anything else.
Does that seem reasonable? I have not seen any good discussion of
this. I think it is rather low. I am guessing that the issue is how
the Linux kernel responds to interrupts. The housework in setting
things up so that the interrupt can run must be the resource hog.
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