How the Values Are Calculated in vSphere Client
VMware calculates these values with Hyperthreading Technology enabled.
The VMware vSphere client shows that “Hyperthreading” is in the “Active” state under the “General” section on the Summary tab for the ESX(i) host within the virtual infrastructure:
As a result, the “Advanced” performance page for this host shows total values for all processors but with the Hyperthreading feature enabled.
Once all object are selected under the Chart Option window, the CPU Usage is displayed for all virtual CPUs and the ESX(i) host itself. Summing up the average values of each virtual CPU and then dividing by the number of virtual CPUs produces a value approximately two times smaller than the TOTAL CPU Usage value for the host.
How the Values Are Calculated in Veeam ONE
Veeam ONE calculates the total CPU Usage without using VMware’s “Total CPU Usage for entire host with Hyperthreading enabled” option. It takes each CPU's Usage and then performs calculations as described above. Thus, in Veeam Monitor, the Total CPU Usage value is two times smaller than CPU Usage for the entire host on VMware’s graphs.