Xen virtualization with Intel-VT

Hej,

for a training i needed some pcs with a virtualization technology preferably from Intel (VT). The easiest way is to buy some pc components and to build thereof a pc. After my last selfmade pc i’m a little bit impaired on that score. So i needed a pre-build pc with a intel cpu, gigabit lan and if it possible: small-sized. So is started my research with my best friend google 😉

After a while i found the transtec SENYO 610.

In the small configuration they have a

inside. But according to the Intel website both cpus didn’t support the Intel VT 🙁 So i needed the big one and they have the following configuration

  • C2D T8300 / C2D T9500
  • 1 GB DDR2 RAM (up to 4GB RAM)
  • 160GB 5400rpm (up to 500GB)
  • Gigalan, Bluetooth, Wlan

So i order the big one with a C2D T8300, 4GB Ram and a 160GB (7200rpm) harddisk. Now i’m waiting for the postman 😀

XEN: clocksource/0 Time went backwards

Everybody know about these sweet line(s):

clocksource/0: Time went backwards: delta=-5802595381342 shadow=440273248432 offset=11586903

To prevent this, add this line to your sysctl.conf

xen.independent_wallclock=1

Next is, to add

extra="clocksource=jiffies"

to the config of your XEN domain (like /srv/xen/build.conf).

After all this, you can reboot the vm’s or to get it working for your current kernel config type this in each vm:

sysctl -p
echo "jiffies" > /sys/devices/system/clocksource/clocksource0/current_clocksource

At the moment i only know this from debian-based systems.