Re: port-arm/57104: "intrctl affinity" does not function on Raspberry Pi 4 and other ARM boards

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

On Sat, 10 Dec 2022 11:38:20 -0500
Brad Spencer <brad%anduin.eldar.org@localhost> wrote:

> I think that this may be a hardware limitation of the RPI SOC.  If I
> remember correctly the RPI can only deliver hard interrupts to CPU0.

This post suggest that at least on Linux, interrupt affinity can be set
for Raspberry Pi 4. You cannot pin one interrupt to multiple CPUs, but
you can pin it to any one CPU, as long as it is one CPU per interrupt.

https://tomcore.io/docs/articles/RaspberryPI/raspberry-pi-4b-network-performance/