Benchmarking The Performance Impact To AMD Inception Mitigations

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  • phoronix
    Administrator
    • Jan 2007
    • 67365

    Benchmarking The Performance Impact To AMD Inception Mitigations

    Phoronix: Benchmarking The Performance Impact To AMD Inception Mitigations

    Last week the AMD Inception vulnerability was made public as a speculative side channel attack affecting Zen processors and different mitigation options based on the CPU generation. There wasn't too much communication around the performance implications of mitigating Inception while over the past week I have begun benchmarking the software and microcode updates on Ryzen and EPYC processors.

    Phoronix, Linux Hardware Reviews, Linux hardware benchmarks, Linux server benchmarks, Linux benchmarking, Desktop Linux, Linux performance, Open Source graphics, Linux How To, Ubuntu benchmarks, Ubuntu hardware, Phoronix Test Suite
  • HEL88
    Senior Member
    • Oct 2020
    • 412

    #2
    Nginx, PostrgeSQL ~12% degradation

    MariaDB 20-40%

    Comment

    • V1tol
      Senior Member
      • May 2016
      • 608

      #3
      Originally posted by HEL88 View Post
      Nginx, PostrgeSQL ~12% degradation

      MariaDB 20-40%
      CPU manufacturers just got a new marketing trick to sell new processors.

      Comment

      • Adarion
        Senior Member
        • Mar 2009
        • 2064

        #4
        Well, besides a few tests it seemed pretty fine, nearly no change. Quite a relief. And maybe these database things can be polished in the future for a little less decrease in performance.
        Stop TCPA, stupid software patents and corrupt politicians!

        Comment

        • Vistaus
          Senior Member
          • Jul 2013
          • 5112

          #5
          Originally posted by HEL88 View Post
          Nginx, PostrgeSQL ~12% degradation

          MariaDB 20-40%
          Yet some people still say these regressions have hardly any impact on AMD. Now for the average end user, that might be true, but for DB users 20-40% is significant…

          Comment

          • cassiofb-dev
            Junior Member
            • Jul 2023
            • 43

            #6
            Originally posted by HEL88 View Post
            Nginx, PostrgeSQL ~12% degradation

            MariaDB 20-40%
            That's some insane performance drop :/
            Well, at least aws does not use amd or intel.

            Comment

            • Sevard
              Phoronix Member
              • Jul 2016
              • 74

              #7
              Originally posted by Vistaus View Post
              Yet some people still say these regressions have hardly any impact on AMD. Now for the average end user, that might be true, but for DB users 20-40% is significant…
              It is, but at the same time it doesn't really matter. These servers don't (or at least shouldn't) run untrusted code, so in most cases mitigations can be safely turned off.

              Comment

              • blackshard
                Senior Member
                • Oct 2009
                • 603

                #8
                Originally posted by Sevard View Post

                It is, but at the same time it doesn't really matter. These servers don't (or at least shouldn't) run untrusted code, so in most cases mitigations can be safely turned off.
                Well, not exactly... if the server is your exclusive property, you may assume in does not run untrusted code.
                But if your server runs VPSs with customer's code (ie: any cloud provider), then you're affected and should not assume that you run trusted code at all.

                Comment

                • jeisom
                  Senior Member
                  • Mar 2013
                  • 271

                  #9
                  I'd also say the code compilation hit is also significant. It may not seem like that much on a high core count epic, but on a Ryzen 6 or 8 core that could turn seconds into several minutes depending on the code base.

                  Comment

                  • Eirikr1848
                    Senior Member
                    • Jan 2022
                    • 437

                    #10
                    Do the vulnerabilities impact pre-Zen CPUs: or is the exploitable architectural component missing in those?

                    Comment

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