Toughts on Virtualization

Hello fellas,

I'm considering to implement some Gentoo Servers on top of VMWare vSphere ESXi. But perhaps this is not the best option.

I was googling about performance issues in this scenario and started to consider some OS-Level VT, like OpenVZ or Linux-vserver, or whatever else.

So I'm here to ask some opinions about virtualization.

My restricted set of rules (LOL):
1. I will not run anything else than Linux.
2. I don't care about GPL, BSD, Icecream, Bacon, or whatever license, since it's free, it's fine.
3. Don't need to be an Opensource solution.

Thanks for any help,