L3 Cache Performance on Windows 11?

Discussion in 'Windows 11' started by Espionage724, Aug 19, 2021.

  1. BlackScout

    BlackScout MDL Member

    Aug 4, 2016
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    #81 BlackScout, Sep 24, 2021
    Last edited: Sep 24, 2021
  2. Espionage724

    Espionage724 MDL Expert

    Nov 7, 2009
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  3. DontuZoru

    DontuZoru MDL Member

    Mar 6, 2014
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    Of course, typical M$..Back to Win10.
     
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  4. MrBeer

    MrBeer MDL Member

    May 23, 2007
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    Build 194 is a week old . I am going to wait for the next update.i think then it should be fixed.
     
  5. pf100

    pf100 Duct Tape Coder

    Oct 22, 2010
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    I like your optimism. On the other hand I think they'll fix it whenever they get around to it which could be the next update or 2 years from now.
     
  6. BlackScout

    BlackScout MDL Member

    Aug 4, 2016
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    I am inclined to think that the issue may still persist but I am not sure. SiSoftware Sandra used to be affected but my last tests show it's no longer the case.
    It would be interesting if AIDA devs spoke about it.
     
  7. prashantsays

    prashantsays MDL Member

    Jun 13, 2016
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    is this also the case with laptop ryzen apus?
     
  8. Stimpy88

    Stimpy88 MDL Member

    Mar 24, 2011
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    FYI, this did not help my 3900x.

    This won't get fixed until after Intel launches it's new CPU, as Win11 seems to be back to the old "WinTel" shenanigans. There are talks of the Win11 scheduler having performance regressions in Ryzen systems over Windows 10 - Best core, core parking, task switching etc.
     
  9. rgba

    rgba MDL Novice

    Sep 12, 2013
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    Good news, everyone!
    amd.com/en/support/kb/faq/pa-400
     
  10. BlackScout

    BlackScout MDL Member

    Aug 4, 2016
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    For those on mobile or who are lazy:

    Issue: Measured and functional L3 cache latency may increase by ~3X.

    Impact:
    • Applications sensitive to memory subsystem access time may be impacted.
    • Expected performance impact of 3-5% in affected applications, 10-15% outliers possible in games commonly used for eSports.
    Issue: UEFI CPPC2 (“preferred core”) may not preferentially schedule threads on a processor’s fastest core.

    Impact:
    • Applications sensitive to the performance of one or a few CPU threads may exhibit reduced performance.
    • Performance impact may be more detectable in >8-core processors above 65W TDP.
    Resolution:
    • A Windows update is in development to address this issue with expected availability in October of 2021.
     
  11. damianfox

    damianfox MDL Senior Member

    Jan 23, 2011
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    I kinda liked Win11 but have since re-installed Win10 because of CPU latency is horrible on my 3900X. Win11 seriously felt unfinished and not even close to the stability and responsiveness of 19044.1237
     
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  12. drei941

    drei941 MDL Novice

    Aug 24, 2012
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    Are you saying you actually felt the difference? Or is it just a number in a benchmark that annoys you?
    Because I'm on a 3900x and it feels perfectly snappy to me... The L3 Cache bug is affecting my system, but I can't say I notice it in any way. Plus it'll get fixed soon.
     
  13. jznomoney

    jznomoney MDL Novice

    Feb 5, 2008
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    I have a 3700x. I play casual games so it's not going to kill me to wait a few weeks for an update. Yes I do feel 11 was rushed through.
     
  14. Espionage724

    Espionage724 MDL Expert

    Nov 7, 2009
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    I have a 2700X, and W11 is notably slower as-is out-the-box, and even with Defender and VBS disabled. I'm under the impression W11 is either on-par with W10 in speed, or worse unless you have the single Intel architecture W11 was primarily designed for. I'm not sure how it could possibly be faster than W10 in its current state.

    I only use Windows for VR, and anything that hampers what little CPU performance headroom I already have will be noticeable. I have no real interest in losing performance for some undetermined amount of time for an OS that offers no tangible benefits :p
     
  15. pf100

    pf100 Duct Tape Coder

    Oct 22, 2010
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    Going by my experience of still getting good frame rates in games, I've been downplaying this whole L3 issue but I see that I was wrong. Glad to see they are going to address it. Seems like this should have been fixed before Windows 11 was released. I know I'm not saying anything that we don't already know, but Microsoft doesn't put as much effort into Windows development as they should and I don't understand why they continue to do that year after year.
     
  16. drei941

    drei941 MDL Novice

    Aug 24, 2012
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    #96 drei941, Oct 6, 2021
    Last edited: Oct 6, 2021
    Well maybe on that processor I believe it (not really tbh)... on a 3900x, though....
    I don't notice any difference in speed, though. Be it just using Windows or gaming.
     
  17. pf100

    pf100 Duct Tape Coder

    Oct 22, 2010
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    That's what threw me on this whole L3 thing, I couldn't tell any decrease in performance in any real world applications.
     
  18. drei941

    drei941 MDL Novice

    Aug 24, 2012
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    I mean I don't intend to say it doesn't matter at all. It most likely does in edge cases, and I absolutely want it fixed.
    I'm just kinda doubting people saying that they're feeling a difference. That's more likely placebo effect, because there's that number that isn't as high as it's supposed to...
     
  19. MELERIX

    MELERIX MDL Expert

    Nov 7, 2011
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    then seems the bug has been fixed but only in Dev builds?