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Re: Any Ryzen 3000 series of benchmarks for MAME?
11/26/19 05:09 PM
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> > Then again, I'm wondering how much the CPU bug/security mitigations have affected
> > performance (although I thought they mostly impacted IO, not just straight number
> > crunching).
>
> That is indeed a very interesting question. Maybe you dont know it, but there are
> different Windows 10 types/builds. AFAIK only version 1607 of Windows 10 has no
> micro-updates and no CPU bug/security mitigations (Spectre etc.). So that is the only
> version, that keeps the CPU unaffected/unthrottled.
Windows doesn't load CPU microcode updates. If you're running Windows, any CPU microcode updates you want to use need to be applied by the BIOS or an EFI module. (Linux does load microcode updates itself.)
Spectre mitigations do reduce performance of system calls. The "variant 2" mitigations tend to have the biggest impact. It's possible to disable "variant 2" mitigation on 1607, 1703 and 1709 with this update: https://support.microsoft.com/en-us/help...ectre-variant-2
There's also information on how to disable some Spectre mitigations with registry settings here: https://support.microsoft.com/en-us/help...nerabilities-in
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