29.03.2018 17:15, Martin Herkt пишет:
So I’ve noticed that the default CPU performance governor on Intel CPUs is still “powersave”. This causes the CPU to stay in the lowest frequency tier most of the time, and effectively disables the Turbo frequency range for “hot” workloads on at least Haswell and newer CPUs, which is probably not what most people want.
It (very) noticeably decreases performance and desktop responsiveness, especially on laptops. Probably also leads to bad benchmark scores for openSUSE on a certain hobby journalist’s website.
And it does not even save power! At least not according to my experience with a laptop (ASUS PU551LD, i5-4210U, SSD, replaced display with higher power
This is Haswell CPU for which intel_pstate is likely used, so "powersave" is misleading. What /sys/devices/system/cpu/cpufreq/*/scaling_driver says?
consumption than the stock model). Idle power consumption with both “powersave” and “performance” governor was exactly the same at slightly less than 5 W according to powertop. No surprise there, really. I do not have a battery plot for actual use (light work and some browsing), but in 4 tries with each governor it actually seems like “powersave” performs worse by half an hour on this hardware.
Could something be done about these defaults? Should I spend some time trying to get actually useful data to support my claims? If so, I’d appreciate a little assistance in figuring out the best procedure for this. Benchmarks are easy to screw up, and I’m sure there are people here with more experience in testing such things.