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• #8941 S_x96x_S addikt

  Új Válasz 2023-08-15 17:10:56 #8941

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  S_x96x_S

  addikt

  Inception ... Ajajj ... rosszabb a helyezet, mint ahogy vártam ..
  még emésztenem kell ...

  Benchmarking The Performance Impact To AMD Inception Mitigations
  https://www.phoronix.com/review/amd-inception-benchmarks

  ----- ZEN3-----------
  "
  One of the real-world areas where the AMD Inception mitigations did hurt the performance was in code compilation speed. The EPYC 7763 server was showing various open-source projects taking a few seconds longer to build now with the safe RET mitigations. Interestingly the new CPU microcode didn't provide much of a difference over the pure kernel-only mitigation run. The alternative IBPB mitigation showed the worst performance penalties."

  "The PostgreSQL database server also recorded some slowdowns as a result of the mitigated kernel."

  
  ----- ZEN4 ------

  
  "Overall it comes down to what workloads you are engaged in whether you may notice any performance difference when upgrading your Linux kernel (or otherwise being patched for Inception on your given OS) on an AMD Zen desktop or server. For the most part users are unlikely to notice anything drastic, aside from some sizable database performance hits in a few cases. It's unfortunate seeing some of these regressions due to the Inception mitigation but ultimately is unlikely to really change the competitive standing of AMD's latest wares on Linux. Most of the prior AMD CPU security mitigations have also not resulted in any performance degradation, so this Inception mitigation difference is a bit rare. It also was announced on the same day as Intel Downfall where there was again a sizable hit to Intel CPU performance. For those wanting to avoid the new mitigation, there is always the "mitigations=off" route or the "spec_rstack_overflow=off" as used in this round of testing (the "off" metrics) for only disabling the Inception/SRSO and leaving all other CPU security mitigations at their respective defaults. I continue to run more AMD Inception and Intel Downfall benchmarks in looking to uncover any other performance differences worth mentioning."

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