Hyper-Threading (HT) has been supported in ESX since version 2.x. The ESX scheduler is aware of HT & treats logical & physical cores differently. vCPUs requesting resources are assigned first to physical cores until all physical cores are loaded. Future vCPU requests are assigned to logical (HT) cores. By this method, HT has no impact on performance until more vCPUs are concurrently executing than exist physical cores.
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