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Testing For The Latest Linux Kernel Power Regression

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  • Michael
    replied
    Originally posted by halo9en View Post
    So.... any updates on this issue?
    Not at the moment, wasn't enough traffic to sanction more immediate tests and follow-up, so pushed down lower on my TODO list until after I get some other more pressing work done.

    Leave a comment:


  • halo9en
    replied
    So.... any updates on this issue?

    Leave a comment:


  • smitty3268
    replied
    Originally posted by Michael View Post
    I did.... If you read all the pages of the article.

    There is an 'idle' test profile - http://openbenchmarking.org/test/pts/idle
    Whoops, sorry about that.

    I actually did read through the whole thing, but somehow skipped over that one.

    In my defense, that should really be the highlighted test, rather than one buried deep down.

    But thanks for making sure you do have that test in there somewhere.

    Leave a comment:


  • Michael
    replied
    Originally posted by smitty3268 View Post
    How can you still not have the most important test of all? A sitting idle doing nothing test.

    Trying to test what power does during other benchmark runs can be interesting, i guess, but it brings in so many other potential factors and typically won't find anything anyway because it swamps out any real regressions with noise.

    What everyone cares about is idle power usage. Surely it'd be easy to add a test which does nothing...
    I did.... If you read all the pages of the article.

    There is an 'idle' test profile - http://openbenchmarking.org/test/pts/idle

    Leave a comment:


  • saski
    replied
    Originally posted by halo9en View Post
    I wonder if booting 3.17 with intel_pstate=disable makes a difference?
    Yes and no. When idle the CPU core frequency stays at its lowest value constantly when using the on demand govenour. however pc states above pc2 are not entered. Power consumption stays with 14-16 Watts idle roughly the same between on demand and intel_pstate.

    Leave a comment:


  • halo9en
    replied
    Originally posted by saski View Post
    Michael, you might want to take a closer look at the intel pstate driver. I suspect it as a major culprit (see changes between 3.14 and 3.15).
    I wonder if booting 3.17 with intel_pstate=disable makes a difference?

    Leave a comment:


  • BSDude
    replied
    Originally posted by saski View Post
    I totally agree. Keeping the idle drain low is very important especially during business meetings with the windows laptops from my coleagues runing twice as long than my linux box with identical hardware.
    Aww that just sucks. Now I wonder how much my laptop would hold while running windows. I wiped it as soon as I got it. Running Antergos I get 4-4.30 hours of life compared to 9 advertised by Lenovo.

    Leave a comment:


  • saski
    replied
    Originally posted by liam View Post
    He included that on page four, iirc. He idled the system for three minutes.
    You are right, though. Idling is the most important test. I wish he'd included the idle test on the high res zenbook. Also, he really needs to integrate those power curves to find the Joules used.
    I totally agree. Keeping the idle drain low is very important especially during business meetings with the windows laptops from my coleagues runing twice as long than my linux box with identical hardware.

    Michael, you might want to take a closer look at the intel pstate driver. I suspect it as a major culprit (see changes between 3.14 and 3.15).

    Leave a comment:


  • liam
    replied
    Originally posted by smitty3268 View Post
    How can you still not have the most important test of all? A sitting idle doing nothing test.

    Trying to test what power does during other benchmark runs can be interesting, i guess, but it brings in so many other potential factors and typically won't find anything anyway because it swamps out any real regressions with noise.

    What everyone cares about is idle power usage. Surely it'd be easy to add a test which does nothing...
    He included that on page four, iirc. He idled the system for three minutes.
    You are right, though. Idling is the most important test. I wish he'd included the idle test on the high res zenbook. Also, he really needs to integrate those power curves to find the Joules used.

    Leave a comment:


  • smitty3268
    replied
    This testing scheme of Michael's is pretty bizarre

    How can you still not have the most important test of all? A sitting idle doing nothing test.

    Trying to test what power does during other benchmark runs can be interesting, i guess, but it brings in so many other potential factors and typically won't find anything anyway because it swamps out any real regressions with noise.

    What everyone cares about is idle power usage. Surely it'd be easy to add a test which does nothing...

    Leave a comment:

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