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

[Carsten Mattner]

On 3/13/18, David Rosenstrauch <darose at 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.