Another look at HPET High Precision Event Timer

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

  1. Vbs

    Vbs Guest

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    I think not. :) If AMD is recommending to reviewers to explicitly delete that value, it means that Windows somehow defaulted to set "useplatformclock enabled" during install (everyone reviewing Ryzen had to install windows from scratch).
     
    Last edited: Mar 7, 2017
  2. EdKiefer

    EdKiefer Ancient Guru

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    Any easy way to tell if CPU supports TSC ?
     
  3. Vbs

    Vbs Guest

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    Get Coreinfo: https://technet.microsoft.com/en-us/sysinternals/cc835722 and unpack it into a folder.

    Open a command prompt on that folder and type: Coreinfo -f | findstr TSC

    The result on an i7-6700:
    Code:
    Coreinfo v3.31 - Dump information on system CPU and memory topology
    Copyright (C) 2008-2014 Mark Russinovich
    Sysinternals - www.sysinternals.com
    RDTSCP          *       Supports RDTSCP instruction
    TSC             *       Supports RDTSC instruction
    TSC-DEADLINE    -       Local APIC supports one-shot deadline timer
    TSC-INVARIANT   *       TSC runs at constant rate
    
    (Asterisks are supported features)
     
  4. TheDeeGee

    TheDeeGee Ancient Guru

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    Missing Option 4... nothing in Bios regarding HPET.
     

  5. EdKiefer

    EdKiefer Ancient Guru

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    results for i5-3570k

    F:\zips and exe\utility\SysinternalsSuite\Coreinfo>Coreinfo -f | findstr TSC

    Coreinfo v3.31 - Dump information on system CPU and memory topology
    Copyright (C) 2008-2014 Mark Russinovich
    Sysinternals - www.sysinternals.com
    RDTSCP * Supports RDTSCP instruction
    TSC * Supports RDTSC instruction
    TSC-DEADLINE * Local APIC supports one-shot deadline timer
    TSC-INVARIANT * TSC runs at constant rate
     
  6. tsunami231

    tsunami231 Ancient Guru

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    Leave it alone no point in missing with any this less you having latency issues.

    If the Bios has no option is most likely ON by defualt Windows by defualt ONLY uses it IF it needed it defualt state does not have it enabled

    Code:
    Coreinfo v3.31 - Dump information on system CPU and memory topology
    Copyright (C) 2008-2014 Mark Russinovich
    Sysinternals - www.sysinternals.com
    RDTSCP          *       Supports RDTSCP instruction
    TSC             *       Supports RDTSC instruction
    TSC-DEADLINE    *       Local APIC supports one-shot deadline timer
    TSC-INVARIANT   *       TSC runs at constant rate
    

    6700k
     
    Last edited: Mar 7, 2017
  7. mbk1969

    mbk1969 Ancient Guru

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    I think they recommend just in case (to be sure), not because it is ON by default.
     
    Last edited: Mar 7, 2017
  8. mbk1969

    mbk1969 Ancient Guru

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    I have impression that Invariant TSC works independently from CPU states as well. Because otherwise Windows should switch QPC function implementation on the fly - regarding C-state of - btw, what exactly? core or whole package?

    https://software.intel.com/en-us/forums/intel-isa-extensions/topic/280440
    And HWInfo also shows whether CPU supports iTSC.
     
    Last edited: Mar 7, 2017
  9. Mufflore

    Mufflore Ancient Guru

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    It seems that disabling HPET can result in skewed benches.
    http://hwbot.org/newsflash/4335_ryz...bias_w88.110_not_allowed_on_select_benchmarks

     
    Last edited: Mar 7, 2017
  10. mbk1969

    mbk1969 Ancient Guru

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    Last edited: Mar 7, 2017

  11. EdKiefer

    EdKiefer Ancient Guru

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    I am not messing with it, mine HPET is enabled in bios and in windows last time I checked.
    Was just curious on the TSC and CPU support.
    I have no problems.
     
  12. dr_rus

    dr_rus Ancient Guru

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    Generally, you shouldn't use HPET as it results in lower overall CPU performance. There are a couple of cases where it may help but they are very old and unlikely to even be relevant these days. Win10 will use TSC on any modern CPU anyway.
     
  13. khanmein

    khanmein Guest

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    i have same result like yours too.
     
  14. khanmein

    khanmein Guest

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    y we should disable HPET & i don't understand. if AMD CPU like Ryzen should disable (recommended by AMD themselves for benchmark) but Intel side no need right?
     
  15. mbk1969

    mbk1969 Ancient Guru

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    Where did you read word "disable" in dr_rus`s comment?
     

  16. Prophet

    Prophet Master Guru

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    First of all the performance loss is negligable. Second, if tsc is used anyway, no harm disabling it. I would stipulate that if you play a game where mouse performance is pertinent that hpet off is preferable for the more direct feeling.
     
  17. EdKiefer

    EdKiefer Ancient Guru

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    So your saying to go against bios and windows default ?
    Asus MB has it default on, if memory is right.
     
  18. khanmein

    khanmein Guest

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    what it mean?
     
  19. mbk1969

    mbk1969 Ancient Guru

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    I thought you were talking about dr_rus`s comment...
     
  20. Mufflore

    Mufflore Ancient Guru

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    As far as I can see, he was.

    Dr rus said
    Implying that HPET should be disabled, which is what his response was based on.
     

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