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Bisected: The Unfortunate Reason Linux 4.20 Is Running Slower

• craftyguy 8y ago
  tl;dr: The cause is the Single Thread Indirect Branch Predictors (STIBP) for cross-hyperthread Spectre mitigation on Intel processors. I'm not sure why Michael thinks this is a surprise, performance regressions were practically on the box with these mitigations.
  • liamkinne 8y ago
    I don't get the general shock that people have over these mitigations slowing performance. Yeah we're throwing out the cash more often, of course it's going to be slower.
    • craftyguy 8y ago
      It gets websites more clicks.
    • FartyMcFarter 8y ago
      A 30% performance drop is pretty shocking.
• deleted 8y ago
  [deleted]