Abouｔ behavior of ntp

Host:XenServer6.2

Guest
OS:Red Hat Enterprise Linux Server release 6.2 (Santiago)
kernel:2.6.32-220.el6.i686
ntp:ntp-4.2.6p5-2.el6_6.i686

We operate a virtual machine on XenServer.
Guest is you are NTP synchronization, but 'offset' is largely shifted.
1 hour = + 10 seconds
Deviation of 'jitter' is also large.

Guest of the NTP that are running on the same host is operating normally.
Configuration file uses the file of essentially the same content.

Ran the command.
・echo "" > /var/lib/ntp/drift
・/etc/init.d/ntp stop
・ntpdate Host
・hwclock -w
・/etc/init.d/ntp start
・ntpq -p

But the problem is not resolved.
Possible causes What are?

Also it had been output in '/var/log/messages'
'freq_set kernel -3310.291'
What are cause this value is high?

Restart want to avoid.