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  • grigi
    replied
    On my Dell M4700, changing from the P-state driver to the generic ACPI one reduced my idle power usage by ~2W... That is quite a bit of power for nothing. I haven't done performance benchmarks, but it seems unaffected.

    Leave a comment:


  • mannerov
    replied
    On Arch with kernel 3.14,

    Using 'performance' over the default 'powersave' (intel P-state) gives a 25/40 % perf boost to Openarena/Xonotic(low) on my radeon card.

    So I wouldn't be suprised intel P-state is to blame on Michael's benchmarks.

    Leave a comment:


  • gens
    replied
    Originally posted by tomtomme View Post
    Are those games CPU limited? Couldn't it be a combination of pstate and hyperz? Afaik it was turned off by default with mesa 10.1.
    openarena probably is
    xonotic is, but less so on high

    gputest triangle is pure buffer flipping while fur shader is (probably) pure gpu molesting
    x264 is pure cpu thing, so..

    Leave a comment:


  • Ericg
    replied
    Originally posted by tomtomme View Post
    Are those games CPU limited? Couldn't it be a combination of pstate and hyperz? Afaik it was turned off by default with mesa 10.1.
    Could be hyperz, could also be MSAA

    Leave a comment:


  • tomtomme
    replied
    hyperz?

    Are those games CPU limited? Couldn't it be a combination of pstate and hyperz? Afaik it was turned off by default with mesa 10.1.

    Leave a comment:


  • andy_v
    replied
    Could the (somewhat) poor performance we are seeing in the OpenGL benchmarks be explained by (the lack of) async DMA? It was disabled in mesa 10.1.2 for R700 cards [1].

    [1] http://cgit.freedesktop.org/mesa/mes...ba2f0f90ea5aba

    Leave a comment:


  • johnc
    replied
    Originally posted by Ericg View Post
    To be fair to Intel... Michael's comments AFAIK there's no grounded evidence that it IS the P-State driver having problems. When I read the article anytime i saw a mention of "Well it could be P-State" I took it with a grain of salt and assumed the comment was being made because the last time there were strange performance decreases (and increases) it did infact come down to CPU Frequency stuff.

    note: I'm referring to the Radeon benchmarks on Ubuntu from a few months ago where a change to the ondemand (old style driver) governor was upping performance by like 10%. If there's been new changes / articles since then that showcase a P-State driver problem then I've apparently missed those articles.
    It seems to be a well-known, established and ongoing problem. Not just with pstate but even the older cpufreq governor as you mentioned.

    Leave a comment:


  • Ericg
    replied
    Originally posted by johnc View Post
    Am I going to buy an Android phone or tablet with an Intel processor if they can't demonstrate competence in handling frequency stepping?
    To be fair to Intel... Michael's comments AFAIK there's no grounded evidence that it IS the P-State driver having problems. When I read the article anytime i saw a mention of "Well it could be P-State" I took it with a grain of salt and assumed the comment was being made because the last time there were strange performance decreases (and increases) it did infact come down to CPU Frequency stuff.

    note: I'm referring to the Radeon benchmarks on Ubuntu from a few months ago where a change to the ondemand (old style driver) governor was upping performance by like 10%. If there's been new changes / articles since then that showcase a P-State driver problem then I've apparently missed those articles.

    Leave a comment:


  • johnc
    replied
    Am I going to buy an Android phone or tablet with an Intel processor if they can't demonstrate competence in handling frequency stepping?

    Leave a comment:


  • johnc
    replied
    I'm just getting frustrated beyond belief with this Intel power governor issue crap.

    Here's a tip for their engineers: pick up the phone, call the Windows division, and ask how they do it.

    Intel definitely comes across as one of those companies where the left hand doesn't have a clue what the right hand is doing.

    Leave a comment:

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