Dear Boyland,
In collaboration with some of this mailing list users, I had put some effort in
optimising the guest settings in function of a windows guest. The libvirt-gui
doesn't include these options. You'll have to edit the XML in virsh. This was
my conclusion on 15-03-2015 but I added the hugepages tip in this list today.
As for networking, I only use or bridged or the default virtual network (NAT),
so can't help you more here.
Here below, a summary of tips:
- Setting video to QXL and the display channel to Spice
<video>
<model type='qxl' ram='65536' vram='65536' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
- Using HyperV enlightenemt timer
<features>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
</hyperv>
<features/>
<clock ...>
<timer name='hypervclock' present='yes'/>
</clock>
- Delete the tablet entry in the input section or set the USB-bus to USB2 or
USB3
- Use hugepages
<memoryBacking>
<hugepages/>
</memoryBacking>
Again thanks Daniel and Andrey.
Hope this helps.
Grts, Dominique.
-----Oorspronkelijk bericht-----
Van: Boylan, Ross [mailto:[email protected]]
Verzonden: vrijdag 20 maart 2015 1:52
Aan: [email protected]
Onderwerp: [libvirt-users] getting oriented/networking
I've been using virt-manager and kvm with a disk image (as in the raw bits)
from a physical windows 7 machine. Initial performance was dreadful, but
improved as I switched to virtio and spice. I've been running linux VM's
somewhat longer (much longer if you count kvm without libvirt).
There are lots of choices exposed by virt-manager. How do I find out what the
choices mean, and which are good ones? This was true for the video (resolved
by following instructions for spice, though I still wonder what the other
settings are for), disks and the network.
In particular, I have a choice of lots of interfaces for my network; I picked
eth1:macvtap because I wanted to bridge eth1. But there is a "Source Mode"
which I left at VEPA, even though Bridged was another choice. But the bridge
would already seem implicit in picking a source device of eth1:macvtap. I
don't know what "source mode" means. The choices in the GUI seem like some of
the options listed under forward on http://libvirt.org/formatnetwork.html; is
that a good place to look for clarification.
I started a 2nd VM that also used eth1:macvtap (with virtio) and it had almost
no network throughput. So maybe I should use some other method? I notice the
network manager connection gui allows creation of bridges on the network;
should I be using that?
I have been reading documentation, but I haven't found either a task-oriented
discussion ("to get a windows machine working well, use these options" or
"follow these steps") or an easy way to go from the choices in the GUI to a
discussion of their meaning.
Thanks for any help you can offer.
Ross Boylan
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