I've recently installed
indicator-multiload on my laptop running Ubuntu 14.10 and noticed my CPU sits most of the time at high frequencies, even with very little load. It is an i7-4700MQ processor which should use frequencies between 800 MHz and 3.4 GHz (with Turbo Boost). Now even when load is 0-2%, the frequencies I see are usually between 2.5 and 3.1 GHz, which means the CPU is almost always Turbo Boosting.
My Ubuntu also uses significantly more power than Windows (where the CPU is often in the 0.8 – 1.8 GHz range) with little load, so I'm thinking it's not just a wrongly displayed frequency.
I haven't manually changed any setting or installed anything that should affect the CPU behaviour. Below is the content of my
intel_pstate, which looks right to me:
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver intel_pstate $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq 800000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 3400000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 2852437 $ cat /sys/devices/system/cpu/intel_pstate/min_perf_pct 23 $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 100 $ cat /sys/devices/system/cpu/intel_pstate/no_turbo 0
Has anyone seen this before or knows how to avoid using high frequencies for no reason?
Just to mention, I know Turbo Boost can be disabled, which would probably limit the max frequency to 2.4 GHz, but that seems like overkill, since I don't want to limit my CPU performance when I need it.
EDIT: The scaling governor is set to powersave:
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor powersave powersave powersave powersave powersave powersave powersave powersave
These are the frequencies:
$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq 2492343 2740218 2502562 2438625 2435718 2782500 2783250 2697000
Nothing is using my CPU. As I said, usage is at about 1%. If I run top, it is the only running user process:
Tasks: 266 total, 1 running, 265 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.3 us, 0.2 sy, 0.0 ni, 98.5 id