4 ms·
Neither Spectre nor Meltdown are related to hyperthreading.
by BeeOnRope 8y ago
Neither Spectre nor Meltdown are related to hyperthreading.
- tux3 8y agoYou're right that Spectre and Meltdown are not related to SMT, but that doesn't invalidate the wider point about hyper-threading and side-channel issues I think. Parent may have simply meant TLBleed/L1TF (Foreshadow) instead of Meltdown/Spectre.
- BeeOnRope 8y agoI'm not trying to invalidate any wider point about hyperthreading, and the original article wasn't trying to make one. It was specifically about Spectre and Meltdown mitigations which are unrelated to hyperthreading, so testing with or without hyperthreading is fine. Bringing up hyperthreading here is like bringing up how a diet high in salt is unhealthy, someone pointing out that salt has nothing to do with the original article, and then a final comment "Yeah, but that doesn't invalidate the wider point that we should consume less salt!".
- sigi45 8y agoI will look it up later but i thought hyperthreading increases it. Perhaps i'm mixing something up but i thought that intel removed smt from the newer generations (is removing it) because of it.
- BeeOnRope 8y agoThere have been other recent vulnerabilities, like the ax/ah thing described in [1] or TLBleed that have relied on SMT, but not Meltdown or the original Spectre variants. [1] http://gallium.inria.fr/blog/intel-skylake-bug/ http://gallium.inria.fr/blog/intel-skylake-bug/