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

Carsten Mattner carstenmattner at gmail.com
Tue Mar 13 07:34:17 UTC 2018

On 3/13/18, David Rosenstrauch <darose at darose.net> wrote:
> On 03/12/2018 09:56 PM, Carsten Mattner via arch-general wrote:
>> 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.
> No BIOS updates.  As far as kernel updates, I do those all the time, so
> not sure that would be the cause.
> After doing some digging, though, I did "cat /proc/interrupts", and this
> line stood out, for having an astronomically high number:
>             CPU0       CPU1       CPU2       CPU3
> ...
>   16: 2424156658          0          0          0   IO-APIC  16-fasteoi
>   uhci_hcd:usb5, parport1
> I have an old PCI card in the machine that's powers an old parallel port
> printer I used to use with it.  Perhaps that's failing.  I don't need
> the card anymore, so I might as well try taking it out and see if that
> makes things better.  If not, I'll be back.  :-)

Let us know in either case. Please tell me it's a huge plotter
you use to make construction plans for your rocket ships.

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