Using kernel 4.8-rc5 I did some energy tests, using a SpecPower simulator that
I made one time. I reused intel_pstate powersave data from a previous test.
Reference:
http://marc.info/?l=linux-kernel&m=147326197513427&w=2
Big numbers are Joules (package Joules from turbostat)
Smaller numbers are watts, 1500 Seconds test run time.
X ~= 18.2% on a real SpecPower.
Load: idle 0.5X X 2X 3X 4X 5X 100%
powersave 5708 11037 16075 29147 45913 61165 76650 81695
3.81 7.36 10.72 19.43 30.61 40.78 51.10 54.46
performance 5749 14536 22841 38475 51757 64425 77000 81733
3.83 9.69 15.23 25.65 34.50 42.95 51.33 54.49
0.7% 31.7% 42.1% 32.0% 12.7% 5.3% 0.5% 0.0%
Note: A real SpecPower test-bed tends to get less dramatic results than
my simulator.
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https://bugs.launchpad.net/bugs/1579278
Title:
Keep powersave CPU frequency scaling governor for CPUs that support
intel_pstate
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