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JCC Erratum Impact On Skylake Xeon Scalable Plus The Patched Assembler

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  • JCC Erratum Impact On Skylake Xeon Scalable Plus The Patched Assembler

    Phoronix: JCC Erratum Impact On Skylake Xeon Scalable Plus The Patched Assembler

    Last week ago we provided a number of benchmarks looking at the performance impact from Intel's Jump Conditional Code (JCC) Erratum that required a CPU microcode update to mitigate but that comes with a performance hit. At least Intel has pending GNU Assembler patches to help offset that performance hit. In time for last week's articles I didn't have a chance to perform Skylake Xeon Scalable (1st Gen) benchmarks but now here are some metrics alongside Cascade Lake...

    http://www.phoronix.com/scan.php?pag...n-Scalable-JCC

  • #2
    Poor Intel, so vulnerable...

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    • #3
      Originally posted by phoronix View Post
      Phoronix: JCC Erratum Impact On Skylake Xeon Scalable Plus The Patched Assembler

      Unfortunately though that assembler work isn't yet mainlined let alone in most Linux distributions outside of Clear Linux.
      In my opinion, by including the above thought in the article, you are contributing to needless proliferation of the effects of CPU errata software patches to CPUs that do not have the erratum (current or future CPUs), with minimal punishment going to the CPU manufacturer who made a mistake when designing a whole line of their CPUs.

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      • #4
        Originally posted by phoronix View Post
        ...
        Thanks for the benchmarks, but kernel (or other) compilation would've been really nice to see.

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        • #5
          I hope this shit never gets upstreamed. Maintainers, do something right for once and reject it.

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