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  • Ubuntu Server 20.04 CPU Security Mitigation Performance Impact

    Phoronix: Ubuntu Server 20.04 CPU Security Mitigation Performance Impact

    Earlier this week I published new benchmarks looking at the desktop CPU security mitigation impact with Ubuntu 20.04. Here are similar tests done in looking at the server mitigation impact with the near-final Ubuntu 20.04 LTS while testing server workloads on Intel Xeon and AMD EPYC server platforms. Like the desktop tests, the mitigation impact with the out-of-the-box protections against Spectre, Meltdown, and friends is being compared to booting the same Ubuntu 20.04 release with "mitigations=off" for run-time disabling of the relevant mitigations on each platform.

    http://www.phoronix.com/vr.php?view=29090

  • #2
    Haswell / Broadwell generation benchmarks would be great, as such hardware is still used today!

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    • #3
      Originally posted by Spacefish View Post
      Haswell / Broadwell generation benchmarks would be great, as such hardware is still used today!
      There is the Haswell benchmark in the article.
      Michael Larabel
      http://www.michaellarabel.com/

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      • #4
        Just inexpertly saying, but re:

        "the Xeon Scalable Skylake server saw a 11~12% hit as well, and the Xeon Scalable Cascade Lake Refresh with its hardware mitigations saw a 5% hit to the performance still from the out-of-the-box mitigations. The AMD EPYC Rome server with its hardware mitigations saw a 5% impact as well from this "mitigations=off" comparison focused on Ubuntu 20.04 Server."

        OTOH, w/ Amd, there is no need to turn mitigations ON, afaict?

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        • #5
          Originally posted by msroadkill612 View Post
          Just inexpertly saying, but re:

          "the Xeon Scalable Skylake server saw a 11~12% hit as well, and the Xeon Scalable Cascade Lake Refresh with its hardware mitigations saw a 5% hit to the performance still from the out-of-the-box mitigations. The AMD EPYC Rome server with its hardware mitigations saw a 5% impact as well from this "mitigations=off" comparison focused on Ubuntu 20.04 Server."

          OTOH, w/ Amd, there is no need to turn mitigations ON with AMD, afaict?
          These are the default mitigations for where AMD is relevant/exposed (or where they otherwise apply a default on AMD CPUs). It was at defaults vs. all off, with not turning any extra "on".
          Michael Larabel
          http://www.michaellarabel.com/

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          • #6
            Did I missed KVM benchmarks?
            Last edited by RussianNeuroMancer; 04-17-2020, 02:05 PM.

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