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Linux 4.17 Offers Some Promising Power-Savings Improvements

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  • #31
    Originally posted by dsmythies View Post

    What is your normal idle power consumption? i.e. how much better is it now?
    EDIT: the savings on the idle test from this report seem to be about 20%, and for a similar processor. I'd sure like to see the idle state 0 data for this test.

    So far, the larger idle system power savings have been on bigger systems, with many 10s of CPUs. Drastic improvement in idle system power consumption for smaller systems is not an expected outcome. One also has to be careful how they define "idle", as they can be quite different between a server with minimal services running and a desktop with a GUI.

    For my older i7-2600k server (with most services disabled. i.e. really very "idle") I get 3.6% processor package power saved.
    However for the Phoronix hiemno test (Single, CPU intensive, thread) gives 1.1% increased performance and a 9.3% processor package power improvement.
    You're right: the power savings are not that significant. I was going off memory from my previous configuration thinking that it idled around 5-6W, but having back to kernel 4.16, I see that it does idle under 5W still. Unfortunately I've got issues with 4.17-rc1 so I won't retest until a working RC comes out.