Ever since Intel introduced Hyper-Threading (known generically as Symmetric Multi-Threading), debates about whether or not to disable the feature have almost entirely revolved around its impact on performance. Back when the feature debuted, it wasn’t unusual for programs to misinterpret what it meant for a system to have a virtual CPU core as opposed to a second physical chip (back then, it was one core to a socket, no exceptions, and programs didn’t differentiate between a physical and a logical CPU core).

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