Fully-virtualized RedHat 5 Xen guest unstable?

After setting up Linux for virtualization and installing Linux as a fully virtualized guest OS, you may find that the Linux guest frequently hangs or uses excessive CPU. Try the following initial troubleshooting steps. Check which kernel version the Linux guest is running with this command. #uname -r If the output looks like 2.6.18-8.el5xen, the wrong kernel version was installed. Install the normal kernel instead, or reinstall Linux without selecting virtualization.