Still about Cpu sharing

Hi,
I am studing how vCenter allocates CPU resource when host is in overcommit state. I have already read some VMWare documents and discussions, but I have not found an answer for my question.

I need a very simple example to explain my doubt.

So supposing to have:

• Host with 1 pCPU of 3.0 GHz
• VM1: 1vCPU, 1000 shares
• VM2: 1vCPU, 2000 shares

When VM1 requests 1 GHz and VM2 2,5GHz, what happens? How cpu resource is allocated to VM1? And to VM2?

If I have understooden correctly the algorithm for:

• VM1 is allocated 1GHz * 1000/(2,5GHz*2000 + 1GHz*1000) * 3 GHz = 0,5 GHz
• VM2 is allocated 2,5GHz * 2000/(2,5GHz*2000 + 1GHz*1000) * 3 GHz = 2,5 GHz

It is correct?

Thanks for your responses and I am sorry for my english XD !