High cpu temperature and fan when loading i195 kernel module

[Luca Franchini]

2017-06-12 10:39 GMT+02:00 Francois Tigeot <ftigeot at wolfpond.org>:

> 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.
>


Hi Francois,

thank you, I'll try soon.

I was also wandering if this fix:

https://gitweb.dragonflybsd.org/dragonfly.git/commit/a1c669c2dd93fe4b582a517eef04068310bc789b

could mitigate those powersaving issues.

Luca