[LAU] Problems with real time kernel, thermal throttling and cpu freq governors.

[Joakim Hernberg]

On Wed, 24 Sep 2014 22:13:48 -0500
Rafael Vega <email.rafa at gmail.com> wrote:

> I'm re-posting this issue here since there are more real-time kernel
> users here than in other lists/forums and I'm hoping to get attention
> into this issue.
> 
> In short, when running the RT kernel from Debian Jessie repos
> (3.14-2-rt-amd64), the scaling governor cannot be changed and the
> system hangs if the cpu temperature reaches the thermal throttling
> threshold.
> 
> More info here:
> http://forums.debian.net/viewtopic.php?f=5&t=117613&p=554270#p554270
> 
> Has anyone experienced this issue? Anyone else running that kernel
> version from the Debian repos? Any other RT kernels for Debian out
> there that I could test?

I can confirm both issues on the archlinux 3.14-rt kernel.

Maybe best to seek a resolution on the linux-rt-users mailing list.

If you have a recent Intel cpu, you might be able to work around the
problems using the /dev/cpu_dma_latency
and /sys/devices/system/cpu/intel_pstate interfaces.

-- 

   Joakim