Thanks for the reply cole... i would like to know whether i should do these changes (apic=1/acip=1) before installing windows xp (multiprocessor) or whether it can be done after windows xp is installed. Thanks again Regards ~Sameer <div class="gmail_quote">On Mon, Nov 24, 2008 at 9:13 PM, Cole Robinson <<a href="mailto:crobinso@redhat.com">crobinso@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><div></div><div class="Wj3C7c">Sameer Naik wrote: > Hi, > I have been using virt-manager for a long long time now. > Recently i have been facing an issue... when i try to install windows xp > (sp3) with multiprocessor > support (i.e. vcpu allocation > 1) the system installs fine, but then > virt-manager displays very high > cpu (24-30%) utilization, even when the xp guest is idle. also when i try to > poweroff the system, i get the "It is now > Safe to poweroff your computer" message and also when this message is > displayed the cpu utilzation is around > 24-30%. > > After posting a similar mail to the xend-users mailing list, i was advised > to use ACPI=1 and APIC=1 in > the domU configuration. But since i am using virt-manager i have no idea > where i should put these values and > whether i need to specify these before installing xp or whether it can be > done after installing. > > Or should i create ahand written domU configuration and use "xm create" to > create the virtual machine? > > Please Help > </div></div>There isn't support in virt-manager for changing acpi and apic values of an existing guest (yet). You can change these values via the command line: virsh dumpxml vmname > xml edit xml: between the <os> block and the <clock> block, add <features> <apic/> <acpi/> </features> virsh define xml If you are using f9 or f10, the above can be simplified with the 'virsh edit' command, which will alter the xml in place. Thanks, Cole </blockquote></div>