Re: [libvirt-users] VM Performance using KVM Vs. VMware ESXi

On Tue, Apr 14, 2015 at 04:53:52PM +0530, Jatin Davey wrote: > On 4/14/2015 4:42 PM, Dominique Ramaekers wrote: >> About Spice: I think it’s good practice to use spice because it >> improves the performance of the VM in general by improving screen >> performance. If your VM is constantly displaying output, you’ll >> probably will notice a difference. >> > [Jatin] Ok, This is not my concern as of now. I will take a look at > it sometime later. >> About virtio: You can see it in the settings. Better yet, it’s in >> your XML. If you post your XML, we can take a look… >> > Here is the xml associated with my VM: > > ******************************** > <domain type='kvm'> > <devices> > <emulator>/usr/libexec/qemu-kvm</emulator> > <disk type='file' device='disk'> > <driver name='qemu' type='qcow2' cache='none'/> > <source file='/var/lib/libvirt/images/****.qcow2'/> > <target dev='hda' bus='ide'/> > <address type='drive' controller='0' bus='0' target='0' unit='0'/> > </disk> This disk is configured to use IDE, so performance of anything that does disk I/O is going to be terrible. You really want to be using virtio. > <interface type='bridge'> > <mac address='52:54:00:c9:58:c9'/> > <source bridge='br332'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > </interface> This doesn't have any model listed at all, so it will be falling back to a generic emulated NIC. Again performance of this is likely going to be terrible for anything doing network I/O. You want to be using virtio for this too. Regards, Daniel