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A Global Switch To Kill Linux's CPU Spectre/Meltdown Workarounds?

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  • A Global Switch To Kill Linux's CPU Spectre/Meltdown Workarounds?

    Phoronix: A Global Switch To Kill Linux's CPU Spectre/Meltdown Workarounds?

    Something I have seen asked in our forums and elsewhere -- most recently on the kernel mailing list -- is whether there is a single kernel option that can be used for disabling all of the Spectre/Meltdown workarounds and any other performance-hurting CPU vulnerability workarounds...

    http://www.phoronix.com/scan.php?pag...p-Spectre-Melt

  • #2
    Soon new CPUs are coming that is expected to have in-silicon mitigations for the Meltdown and Spectre hardware vulnerabilities.
    Such as the upcoming Intel "Ice Lake" CPU.
    Maybe also upcoming Ryzen.

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    • #3
      Originally posted by phoronix View Post
      Phoronix: A Global Switch To Kill Linux's CPU Spectre/Meltdown Workarounds?

      Something I have seen asked in our forums and elsewhere -- most recently on the kernel mailing list -- is whether there is a single kernel option that can be used for disabling all of the Spectre/Meltdown workarounds and any other performance-hurting CPU vulnerability workarounds...

      http://www.phoronix.com/scan.php?pag...p-Spectre-Melt
      thanks for this, was looking for it recently

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      • #4
        for first two I would use nopti nospectre_v2 as they are simply shorter, but as for l1tf=off & no_stf_barrier it is first time I even hear about them...

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        • #5
          Thanks for this post. Please do not forget the games benchmarking, I know for at least some of us, gaming is a huge thing.

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          • #6
            Originally posted by creative View Post
            Thanks for this post. Please do not forget the games benchmarking, I know for at least some of us, gaming is a huge thing.
            The gaming impact is quite small especially compared to I/O and other workloads, but the desktop CPU tests will probably include them.
            Michael Larabel
            http://www.michaellarabel.com/

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            • #7
              Originally posted by creative View Post
              Thanks for this post. Please do not forget the games benchmarking, I know for at least some of us, gaming is a huge thing.
              In games the CPU is rarely a performance issue, especially Vulkan games, all that matters is that you have a good GPU, lots GPU memory, lots of RAM memory and at least 2 or 4 cores on the CPU.

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              • #8
                Originally posted by cl333r View Post

                In games the CPU is rarely a performance issue, especially Vulkan games, all that matters is that you have a good GPU, lots GPU memory, lots of RAM memory and at least 2 or 4 cores on the CPU.
                Actually, most games are limited by the CPU, and usually because the game does not take advantage of as many threads as it could.

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                • #9
                  How come `noretpoline` didn't make the list? Is it implicitly included in one of the other ones?

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                  • #10
                    "pti=off spectre_v2=off l1tf=off nospec_store_bypass_disable no_stf_barrier"

                    Does it disable ALL the mitigations or some of them cannot be simply disabled?
                    ## VGA ##
                    AMD: X1950XTX, HD3870, HD5870
                    Intel: GMA45, HD3000 (Core i5 2500K)

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