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 have happened. 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. Opinions? Suggestions? -- Roger Oberholtzer -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
