I have a IBM XSeries 366 with 04 processors Intel Xeon 3.16 Ghz, 16 Gb of memory and a storage IBM with 2 terabytes. I work with virtualization and my OS in this machine is a VMware ESX 2.5.3 version. When I install CentOS 4.X as guest operating system under ESX, the performance is very very bad. When I intsall RHES4 as guest operating system under ESX, the performance is very good. It will be that it has some problem CentOS to work with virtualization?