Hi guys,

We are experiencing some problems with our Windows 7 guests running on
KVM. This specifically relates to the time sync which is always off,
way off. Here is a quick rundown of the setup that we have done. My
apologies if this is too much detail but about two days on Google and
tried all things I could find have not resolved this issue thus far.

Install:
Scientificlinux 6.1 Minimal install
Added the following packages after a yum update: bridge-utils, curl,
emacs, htop, iotop, kpartx, mc, ncftp, nfs-utils, ntpd, rsync, ruby,
urw-fonts, vim, wget, xauth, xorg-x11-fonts*
Added EPEL
Created the bridge
Set selinux to permissive
Added the following packages: libguestfs-tools, libvirt,
python-virtinst, virt-manager, virt-top, virt-viewer

VM Added:
Added one new VM, Windows 7 Enterprise Edition with SP1. No virtio drivers used.
Added one new VM, Windows 7 Enterprise Edition with SP1. Virtio drivers used.

I have attached one xml document at the end of this email showing the
current config.

The most bizarre solution I have tried thus far is setting up a local
NTP server and having the Windows machine update every 5 seconds.
Still, same problem.

We have tried many different configs and solutions but to no luck.

Any help in this matter is highly appreciated.

Thanks
Petter

=== CURRENT CONFIG ===
<domain type='kvm'>
  <name>build-win7-1</name>
  <uuid>9b5f36a6-468a-1ac7-5a34-0a1dcfa82656</uuid>
  <memory>2097152</memory>
  <currentMemory>2097152</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='rhel6.1.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='localtime'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/var/lib/libvirt/images/build-win7-1'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </disk>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='00:16:36:7f:72:80'/>
      <source bridge='br0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
    <video>
      <model type='vga' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
    </memballoon>
  </devices>
</domain>
=== END CURRENT CONFIG ===

-- 
Petter Olsson
System Administrator
NumberFour AG