Hello, I use several kvm box, and no problem at all except for 1 application that have bad response time. The VM runs Windows 2008R2 and the application is an client-server app develop with progress software and talk to an Oracle databasei (on another server) and we access this app with RDS/TSE. The physical server runs Debian testing to have qemu-kvm 1.0 and linux kernel 3.1 and libvirt 0.9.8. We use virtio for disk and network and use the last driver for Windows (from RH). We have 2 references servers : one physical and one running Vmware. Response time : o physical = 7s o VM under vmware = 8s o VM under KVM = 12s (to complete with qemu-kvm 0.12.5 and kernel 2.6.32 we have 22s ...). I attach the libvirt xml of my vm. How can I see what's append ? Do you have idea to increase performance ? David. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html