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Benchmarking AMD Zen 3 With Predictive Store Forwarding Disabled

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  • #21
    Originally posted by Peter Fodrek View Post
    This feaure mainly helps to speedup in multimedia and matrix operations/instruction
    Do you have any sources on this (other than the ones in your post, which are unrelated to PSF)?

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    • #22
      Originally posted by coder View Post
      Do you have any sources on this (other than the ones in your post, which are unrelated to PSF)?
      Zen 3's Predictive Store Forwarding aims to enhance performance by trying to predict dependencies between loads and stores. PSF can speculatively execute instructions based on what it thinks the result of the load will be and while the predictions should be largely accurate, there is the possibility of incorrect CPU speculation.
      https://www.phoronix.com/scan.php?pa...urity-Analysis

      PSF acts as a alternative to link form FPU part exit to FPU aprt entry in Core


      that is misisng in K8 a Zen as well


      from
      https://www.anandtech.com/show/1998/4

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      • #23
        Found one comment online that the SPEC benchmarks might be impacted by this feature.

        No idea if that's true or not.

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