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Thread Director doesn’t do any directing, it’s a a set of new registers the OS scheduler is supposed to read for feedback on how well a thread is running on a core. If APO can do it right, it means the scheduler is wrong.
15.6 HARDWARE FEEDBACK INTERFACE AND INTEL® THREAD DIRECTOR
Intel processors that enumerate CPUID.06H.0H:EAX.HW_FEEDBACK[bit 19] as 1 support Hardware Feedback
Interface (HFI). Hardware provides guidance to the Operating System (OS) scheduler to perform optimal workload
scheduling through a hardware feedback interface structure in memory.
Thread Director doesn’t do any directing, it’s a a set of new registers the OS scheduler is supposed to read for feedback on how well a thread is running on a core. If APO can do it right, it means the scheduler is wrong.