Re: [arch-general] High CPU on one core, but unable to find process responsible

On 3/13/18, David Rosenstrauch <darose@darose.net> wrote:

So if this issue is irq-based, I guess that means some piece of hardware is faulty or failing. Any idea how I might go about pinning down which one? Would there be info in the kernel log about this? Or something that I can look at in /proc?

Any BIOS updates or kernel updates recently (4.15.8)? Try with 3.16 or 4.9 or another old lts kernel from archive.archlinux.org just for testing (not production). It's more likely that the kernel regressed rather than IRQ issues popping up suddenly. It's possible but less likely.