vCPU contention 1:2 ratio

[Dhakshinamoorth]

Hi There,

I would to like to know whether my math for CPU contention ratio is correct or not.

We have a server with 2 x 16 Core Physical sockets. So, Total Physical cores in the server = 32.

After Enabling Hyper-threading, we will get Logical processors of 64 (32x2).

If i want to keep the contention ratio 1:2, then i can allocate 128 vCPUs to the VMs.

Kindly confirm if this is correct.

[rcporto]

With allocation ratio of 2:1 (2 vCPUs to every pCPU) you can allocate 128 vCPUs, but take in mind to avoid allocate more vCPU to a single virtual machine than it needs, always start small and add new vCPU only when needed.