Time synchronization in guest machine

Hi,

I have a question, Linux customers have the wrong time, with a lag of a few seconds over time.

The hypervisors have when properly configured.

Not if I activate NTP service customers, or whether the customer takes the time hypervisor.

I tested. I have a client without NTP and has a gap of 10 seconds and rising.

I have another client with the NTP service started, but with a lag of a few seconds.

As I read, would be enough to put this in the ntp.conf configuration and comment lines of "server"

server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10

Linux clients are not synchronized with HOSTs? RHEV must be enabled in the NTP client pointing to a time server?

more info:
HOST: RHEV 3.1
Guest: RHEL 5.7 (machines migrated from xen)

Thanks!