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
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