On 01/21/2010 05:18 AM, Ryan Pugatch wrote: > Hello all, > > I have a PowerEdge 2950 that I am using to host Windows XP VM's under > CentOS. I am experiencing poor performance in the Xen VM's. Any time I > try to do something, the CPU usage (as reported by the Windows task > manager) hits 100% for a few and then drops back down. This is causing > the VM's to run sluggish and be quite annoying to use. Example.. I > click IE.. cpu hits 100% and IE takes a bit to open. I go to a > website.. 100%.. I click a link.. 100%. This is the case even if I only > have one VM running. > > I now have 32 VM's running on the machine and dom0's cpu usage as > reported by xm top is 622%. It seems like Xen is just performing poorly > while handling these Windows VMs. Any suggestions? I have Windows VM's > on other hardware (typically PowerEdge R905s and R710s and they seem ok). > > This 2950 is a decent machine.. 32G RAM, 2x Xeon E5405 (quad core) at > 2ghz. And I'm only allocating 1 CPU and 768MB RAM for each VM. > > Sample config: > > name = "win01n" > maxmem = 768 > memory = 768 > vcpus = 1 > builder = "hvm" > kernel = "/usr/lib/xen/boot/hvmloader" > boot = "c" > pae = 1 > acpi = 1 > apic = 0 > localtime = 1 > on_poweroff = "destroy" > on_reboot = "restart" > on_crash = "restart" > device_model = "/usr/lib64/xen/bin/qemu-dm" > usbdevice = "tablet" > sdl = 0 > vnc = 1 > vncunused = 0 > vncdisplay = "1" > disk = [ 'file:/var/xen/running/win01n,ioemu:hda,w' ] > vif = [ "bridge=xenbr0" ] > serial = "pty" > > > > Thanks in advance for any insight! > > Check Pasi's advices from http://lists.centos.org/pipermail/centos-virt/2009-August/001121.html , maybe they apply to you too