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A Last Minute Linux 4.17 Pull To Help Non-PCID Systems With KPTI Meltdown Performance

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  • A Last Minute Linux 4.17 Pull To Help Non-PCID Systems With KPTI Meltdown Performance

    Phoronix: A Last Minute Linux 4.17 Pull To Help Non-PCID Systems With KPTI Meltdown Performance

    While the Linux 4.17 kernel merge window is closing today and is already carrying a lot of interesting changes as covered by our Linux 4.17 feature overview, Thomas Gleixner today sent in a final round of x86 (K)PTI updates for Meltdown mitigation with this upcoming kernel release...

    http://www.phoronix.com/scan.php?pag...bal-Pages-4.17

  • #2
    I've been testing it for a week. Yes, it advances the results in benchmarks.
    perf stat --null --sync --repeat 10 perf bench sched messaging -g 20 -t

    It is certainly untested on laptops. It broke down hibernation.

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    • #3
      Originally posted by latalante View Post
      I've been testing it for a week. Yes, it advances the results in benchmarks.
      perf stat --null --sync --repeat 10 perf bench sched messaging -g 20 -t

      It is certainly untested on laptops. It broke down hibernation.
      And, can you offer some 'real' numbers, with and without, please?

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      • #4
        GREAT, I'll send some numbers (Xeon X3470, Lynnfield, Nehalem based) when Alex updated amd-staging-drm-next to 4.17-rc1. Currently I'm running with nopti and nospectre_v2 during Mesa radeonsi/radv benchmarking...
        Last edited by nuetzel; 04-15-2018, 07:14 PM.

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        • #5
          Originally posted by nuetzel View Post

          And, can you offer some 'real' numbers, with and without, please?
          I forgot to add in synthetic micro-benchmarks. For this example, about 50% improvement. How does this translate into real applications? Probably very little.
          It's a very old laptop (2006) with Core Duo 2 ("first generation").
          This test. https://github.com/paboldin/meltdown-exploit
          It does not show that it is vulnerable to meltdown.
          and spectre
          https://gist.github.com/ErikAugust/7...file-spectre-c
          Though it may be.

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