VMware guest clock runs ahead or behind

In our case occured on VMware server running on a dual Xeon Windows 2003 server (x64) with an i386 CentOS 5 guest.

Changes on guest;

In /etc/grub.conf add “clock=pit nosmp noapic nolapic” to kernel line;

kernel /vmlinuz.... clock=pit nosmp noapic nolapic

Changes on host;

Edit VMX file of guest and add (or change false to true):

tools.syncTime = "TRUE"

Sources:

http://kb.vmware.com/selfservice/microsites/search.do?lang=en_US&cmd=displayKC&externalId=1420

http://www.vmware.com/pdf/vmware_timekeeping.pdf