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STIBP, collaborate and listen: Linus floats Linux kernel that 'fixes' Intel CPUs' Spectre slowdown

bazza Silver badge

It's not just Intel AFAIK.

This whole sorry saga was kinda inevitable as soon as CPUs started having microcode; someone was sooner or later going to end up with a micro architecture that didn't really implement the advertised machine architecture.

OK, it was a way of getting better performance from existing software on new CPU designs, but we're paying a price for that now. Perhaps if microcode wasn't so opaque, perhaps if we didn't use it at all, problems like this would be more readily apparent before they got burnt into decades worth of CPUs.

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