I am trying to scale down one of the CPU frequencies. I am using Ubuntu 14 and Linux kernel 4.4. I want to scale down the cpu3 frequency to 1.2 CONSTANT (no throttle).
Things I have tried:
I want to scale it down by booting with intel_pstate=disable in the /etc/default/grub but upon booting the cpu freqeuency module does not appear anymore. (as per the comments)
cpupower -c 3 frequency-set -f 1.2 Setting cpu: 3 Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?) Yes
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available, for example because of hardware which cannot be set to a specific frequency or because the userspace governor isn't loaded? Lack of userspace seems to be the problem
Tried to assign the cpu3 powersave governor and the rest performance governor. This way i could change the ranges. However the changes still appear on ALL the cpus
cpupower -c 3 frequency-set --governor powersave --min 1200MHz --max 1200MHz
Tried assigning 1.2 to the maximum available frequency file but it generate an error of invalid argument.cpupower -c 3 frequency-set --governor powersave --min 1200MHz --max 1200MHz
Can I install other drivers? The server I am working on is production. Real sensitive. Can't take any chances.
This is the current state of my PC.
Every 0.1s: cat /proc/cpuinfo | grep "^[c]pu MHz" cpu MHz : 2902.593 cpu MHz : 2901.093 cpu MHz : 2900.343 cpu MHz : 2901.281 cpu MHz : 2823.093 cpu MHz : 2901.843 cpu MHz : 2900.812 cpu MHz : 2800.593 cpu MHz : 2800.218 cpu MHz : 2800.312 cpu MHz : 2506.593 cpu MHz : 2800.406 cpu MHz : 2800.875 cpu MHz : 2800.312 cpu MHz : 2901.281 cpu MHz : 2901.093 cpu MHz : 2801.718 cpu MHz : 2900.812 cpu MHz : 2899.875 cpu MHz : 2900.250 cpu MHz : 2800.406 cpu MHz : 2800.312 cpu MHz : 2800.218 cpu MHz : 2899.968 cpu MHz : 2800.406 cpu MHz : 2726.156 cpu MHz : 2900.437 cpu MHz : 2900.625
What can I do?