I'm completely making stuff up here, but I wonder if this is the effect of some ... | Hacker News

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gpderetta on Nov 30, 2023 | parent | context | favorite | on: Rust std fs slower than Python? No, it's hardware

I'm completely making stuff up here, but I wonder if this is the effect of some last minute (or even post-release, via ucode update) bug fix, where page aligned fast rep movs had issues or were subject to some attack and got disabled.

renonce on Nov 30, 2023 [–]

Then fast rep movs should have been disabled in cpuid altogether

gpderetta on Dec 1, 2023 | [–]

They might have benchmarked a set of loads they care about and seen that on average leaving that set was better. But they are all conjectures.

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