Hi all, When we tested windows guest OS, the time drift case was occured. It meant the clock of windows mv gredually lost a few seconds per minute. It occured especailly the CPUs are working hard. For syncing between Hypervisor and windows vm, we need to other option into libvirt template. I submitted a blue-print to openstack ice house. https://blueprints.launchpad.net/nova/+spec/add-no-hpet-option-into-guest-clock If you're interested, please teke a look and have a comments. Regrads, John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20131220/6c61c27a/attachment.html>