[CentOS-virt] Windows Xen VM's have high guest CPU usage and poor performance

Thu Jan 21 16:30:17 UTC 2010
Eric Searcy <emsearcy at gmail.com>

> The install worked beautifully except that my VM now has an ip assigned
> of which I'm guessing is in relation to virbr0 which is
> on the host (and subsequently has no internet
> connectivity).  Is it possible for me to pass through to my network like
> before so my VM can have an ip on my local network?

Unless you specify a bridge in the xen conf file, it uses the first one it finds alphabetically, I believe.  Do you use virbr0 for anything else?  As an easy way of making sure xenbr0 is used, I removed the file /etc/libvirt/qemu/networks/autostart/default.xml which was auto-starting this DHCP (and NATted?) bridge, and I only was using direct access.  But you can also make it explicit on the interface line, one of my HVM VMs has the following:

vif = [ 'mac=00:16:3e:0a:4c:d2, bridge=xenbr0' ]

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