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• #4925 S_x96x_S addikt S_x96x_S #4919

  Új Válasz 2021-04-05 02:40:21 #4925

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  S_x96x_S

  addikt

  válasz S_x96x_S #4919 üzenetére

  Benchmarking AMD Zen 3 With Predictive Store Forwarding Disabled
  https://www.phoronix.com/scan.php?page=article&item=amd-zen3-psf&num=1

  
  
  
  "So long story short, even though AMD isn't recommending their customers at large disable Predictive Store Forwarding, if you decide to disable it in the name of increased security it's not likely going to provide any meaningful performance difference. I'm still running some larger server workloads but with everything I've seen today and yesterday across multiple Zen 3 systems the PSF disabling isn't having any major impact... Will update if managing to find any configuration / large workloads there there is a meaningful difference from disabling PSF but at this stage looks to be of limited impact in toggling it at least for common test case scenarios. Thankfully nothing as scary as some of the past x86_64 speculative execution mitigations we have seen in recent years -- just a few days ago in fact looking at the Spectre mitigation costs still being carried by Intel's Rocket Lake, among many other examples and benchmarks over the past three years."

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