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Why does Linux run so well on ARM
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this post was submitted on 20 Aug 2023
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Small correction: the flag setting modes aren't undocumented. They're standardized extensions. ARMv8.4 added
FEAT_FlagM, and ARMv8.5 addedFEAT_FlagM2.https://developer.arm.com/downloads/-/exploration-tools/feature-names-for-a-profile
IIRC, the only nonstandard ARM extension used by Rosetta 2 in Apple's processors is TSO, and that's also implemented by other manufacturers. It's also not a hard requirement to run
amd64under ARM. You can emulate it very slowly or restrict the application to a single core.Apologies for the tangent, but I needed to make sure nobody could defend Microsoft's prior failings by saying "but Apple has secret hardware sauce".
So while not technically "secret sauce," it's certainly "special sauce." Good point.