High cpu temperature and fan when loading i195 kernel module

[Matthew Dillon]

Note that those livelock thresholds are global, so they may mess up (slow
down greatly) disk I/O and network I/O too.  I won't have time until July
to put together a workaround, but perhaps Sephe can extend his
kern.livelock_limit_hi feature into a kern.livelock_limit_lo feature that
is then flagged for the ACPI interrupt as a more permanent workaround.

-Matt

On Mon, Jun 12, 2017 at 1:39 AM, Francois Tigeot <ftigeot at wolfpond.org>
wrote:

> Hi,
>
> On Wed, May 17, 2017 at 08:58:26PM +0200, Luca Franchini wrote:
> >
> > thank you for answering and for your work too. I'll will stay tuned for
> > next updates.
>
> Thanks Luca!
>
> With the help of dillon@, I noticed the first core of my Skylake laptop
> was
> being pegged by acpi interrupts:
>
> [systat -pv 1 output]
>        timer     ipi  extint user%  sys% intr% idle%  smpcol
> cpu0     238      11   25316   0.0  51.1  48.1   0.8       0
>
> [vmstat -i output]
> interrupt                    total       rate
> acpi0                     89216043      23348
>
> Setting a much lower treshold for misbehaving interrupts made the laptop
> usable. These are the sysctls I used:
>
> kern.livelock_lowater=1000
> kern.livelock_limit=2000
>
> It's far from perfect though and power usage is still excessive; I'll try
> to learn more about the acpi subsystem in order to find out what exactly
> is going wrong here.
>
> --
> Francois Tigeot
>
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