Another look at HPET High Precision Event Timer

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by Bukkake, Sep 18, 2012.

  1. Groot

    Groot Member

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    GPU:
    GTX 1080
    Some QPC results with Haswell and TSC

    Code:
               QPC Calls/s   |    Relative
                 Millions    |   Speed to W7
    W7  SP1         192      |      100%
    W10 1703        192      |      100%
    W10 1709        118      |       61%
    W10 1903         87      |       45%     
    Seems 1709 introduced serializing for TSC and runs RtlQPC a little quicker than QPC, at 122 million calls per second. Results may vary with different HW / code paths and cache retention. For comparison HPET runs at around 1.67 million calls per second on a singular IO while TSC can run concurrently on each thread, better not get them out of sync though.
     

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