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If after applying VMware vSphere (ESXi) security update - ESXi-6.7.0-20190504001-standard (Build 13644319) - https://kb.vmware.com/s/article/55636 and adding VMkernel.Boot.hyperthreadingMitigation = TRUE After restarting ESXi you notice half the number of logical processors (e.g. hyperthreading disabled!) - this is NORMAL!. "Enabling this option will result in the vSphere UI reporting only a single logical processor per physical core; halving the number of logical processors if Hyperthreading was previously enabled. In addition Hyperthreading may be reported as 'Disabled' in various configuration tabs."
BEFORE UPDATE VMkernel.Boot.hyperthreadingMitigation = false
AFTER UPDATE VMkernel.Boot.hyperthreadingMitigation = true