Am 30.11.2017 um 10:59 schrieb Roger Oberholtzer:
We have written a minimal kernel interrupt handler for
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.
I don't see anything openSUSE-specific in here, so I'd suggest to ask on
upstream linux-rpi-kernel list about any performance expectations.
Personally I haven't had any success using GPIO interrupts on my rpi3,
but that may be a matter of the device/driver (SX1276) I tried it with.
Can you share any more details on DT overlay or driver init you're using
to set up the interrupt? What's your interrupt source?
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