Both the conservative method and the match-to-logical-core method are viable approaches, with the latter being seen as the more aggressive of the two in achieving performance results.

This “exactly committed” approach is used in demanding situations where the best performance is a requirement. When hyperthreading is enabled at the BIOS level, as is recommended, the total number of vCPUs in all VMs on a host server can be set up to be equal to twice the number of physical cores-that is, equal to the number of logical cores on the server.If that type of waiting were to occur, the administrator would see a sustained increase in %Ready time as measured by the vSphere performance tools. This more conservative approach ensures that no vCPU is waiting for a physical CPU to be available before it can execute. One viable approach here is that the total number of vCPUs configured across all VMs on a host server is equal to the physical core count on that server. The physical CPUs on the vSphere host should not be overcommitted.Reserve about 5-6% of total server memory for ESXi use the remainder for the virtual machines. The sum of all the memory size configured in the VMs on a server should not exceed the size of physical memory on the host server.

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