Virtual and physical cores

[MariusRoma]

I need to check performance issues in a VMware vSphere 5.5 infrastructure based on 4 ESXi 5.5 hosts.

Some specialists say that VMware suggests as a general rule to avoid using more that 4 virtual cores for each physical core.

Is such 4:1 relationship true?

Is it documented anywhere?

Regards

marius

[daphnissov]

It's a general guideline, but like everything else, your results may vary. Some workloads perform just fine at a 4:1 subscription ratio while others do not.

[SupreetK]

In this context, below article is a good read -

How to decide VMware vCPU to physical CPU ratio​

Please consider marking this answer as "correct" or "helpful" if you think your questions have been answered.

Cheers,

Supreet

[MariusRoma]

Many thanks for the very interesting pointer.

Is there any "official" VMware document about the same subject?

Regards

marius

[daphnissov]

Yes, read the performance guide for the vSphere documentation.