Windows 10 1809 Benchmarks. The Spectre patch kills performance.

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  1. Kol12's Avatar
    Posts : 2,784
    Windows 10 Pro ver 20H2
       #11

    There is this article which gives instructions should you wish to disable the spectre/meltdown fixes in the OS. I'm curious to test performance with it disabled.

    However at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management in the registry I do not have “FeatureSettingsOverride” or "FeatureSettingsOverrideMask", I just have "FeatureSettings".

    Is it possible this has changed in Windows 1809? Or am I actually supposed to add those entries into the registry?

    Starts at Switch | Registry settings

    https://support.microsoft.com/en-us/...erabilities-in
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  2. Posts : 11
    Windows 10
    Thread Starter
       #12

    To disable Spectre, I used this tool from Gibson Research, whom I am assured are a respectable organisation who specialise in this sort of thing.

    https://www.grc.com/inspectre.htm
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  3. Kol12's Avatar
    Posts : 2,784
    Windows 10 Pro ver 20H2
       #13

    craker said:
    To disable Spectre, I used this tool from Gibson Research, whom I am assured are a respectable organisation who specialise in this sort of thing.

    https://www.grc.com/inspectre.htm
    That would disable all of Microsoft's Spectre and Meltdown patches in the OS would it?

    Edit: Can you re-enable from the same buttons afterwards?
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  4. Posts : 11
    Windows 10
    Thread Starter
       #14

    Kol12 said:
    That would disable all of Microsoft's Spectre and Meltdown patches in the OS would it?
    That's what it says it does, my only means of testing this is to run my benchmarking tool and note the increased performance.

    And, of course, you can enable the patches again once you're done. Reboot the machine each time the patch is enabled or disabled.
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  5. Kol12's Avatar
    Posts : 2,784
    Windows 10 Pro ver 20H2
       #15

    craker said:
    That's what it says it does, my only means of testing this is to run my benchmarking tool and note the increased performance.

    And, of course, you can enable the patches again once you're done. Reboot the machine each time the patch is enabled or disabled.
    So was your increased performance significant? Which benchmarking tool? Well I am particularly interested to see what/how much effect disabling the patches has on an in game benchmark so will give this a go.
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  6. Posts : 11
    Windows 10
    Thread Starter
       #16

    Kol12 said:
    So was your increased performance significant?
    See the first post in the thread. I've repeated this test on a different machine (which was much quicker with 1809) for some reason. It's all new hardware (i7 4790, i7 4770); I've read suggestions that older CPUs are more vulnerable to slowdown.

    This is an in house benchmarking tool for our CAD application; it's is an old MFC app. that uses GDI to draw things. What I understand is that GDI uses alot of system calls that are much more prone to being slowed down by the Spectre patch. More modern apps and games that use hardware accelerated graphics / directx / opengl are less likely to be hit by the patch.

    That said, I'm getting a 30%-40% decrease in performance which is pretty dire.
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  7. Kol12's Avatar
    Posts : 2,784
    Windows 10 Pro ver 20H2
       #17

    @craker

    Interesting. Somebody I know seems to think that their gaming frametime's smoothed out considerably after disabling the patch so there a probably system calls when gaming also. Do you mean 1809 was quicker with or without the patches disabled?
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  8. Posts : 11
    Windows 10
    Thread Starter
       #18

    Oh, 40% quicker benchmarks when the Spectre patch was disabled. Might be worth waiting for the release build before coming to a firm conclusion though.
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  9. Kol12's Avatar
    Posts : 2,784
    Windows 10 Pro ver 20H2
       #19

    Do you mean 1809 was 40% quicker than Windows 1803?
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  10. Posts : 11
    Windows 10
    Thread Starter
       #20

    No this is only on 1809.

    It's just occurred to me that the Spectre patch is already delivered to some Windows versions, so linking 1809 with Spectre is unhelpful.

    Bottom line - spectre patch makes my app benchmarks run 40% slower.
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