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Linux 6.13-rc3 fixes expensive CPUID handling on Sapphire Rapids CPUs — an issue resulting in Skylake CPUs being 4X faster for CPUID-related updatesSpecifically, Google's Sean Christopherson states, "On Intel's Emerald Rapids, CPUID is *wildly* expensive, to the point where recomputing XSAVE offsets and sizes results in a 4x increase in ...
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