[Spice-devel] spice 0.6.3 slower than 0.4?

Alon Levy alevy at redhat.com
Mon Mar 14 01:28:30 PDT 2011

On Mon, Mar 14, 2011 at 09:07:45AM +0100, Vermonden David wrote:
> Hi
> First and foremost thanks for this great software!
> I installed the vdagent (service) and the qxl driver 0.6.1 on a
> XPSP3-guest succesfully. However I don't manage to install the
> virtio-serial driver. Is it necessary? Is this the replacement for the
> vdiport driver in version Spice 0.4?

Yes. To run vdagent you will need virtio-serial driver.

> I start the machine on a Fedora 14 with Spice 0.6.3 like this:
> "qemu-system-x86_64 -boot c -drive
> file=/vms/xpsp03_01.img,if=virtio,boot=on -soundhw ac97 -nographic -net
> nic,macaddr=52:54:00:13:9f:17,model=virtio -net
> tap,ifname=XP3,script=/etc/lan-ifup -vga qxl -spice
> port=5931,disable-ticketing -enable-kvm -m 1024"
> When using Spice 0.6.3 or 0.8 it is much slower then version 0.4. How

What is slower specifically? have you tested the same qemu in both cases?
if you are using qemu and not qemu-kvm the speed difference could be just that.
Can you compare your newer qemu to the older qemu without spice?

> can I check whether Spice is successfully enabled on the client? Using
> the spicec 0.6.3 or 0.8 is even slower than VNC and I know from version
> 0.4 that Spice should perform much better. I tested by playing the same
> movie on the same guest for spice 0.4, 0.6.3 and 0.8.

What qemu versions did you use for each? or did you forward port spice 0.4 to
the current qemu?

> I also played arround with the options in Qemu 0.14 for spice (spice 0.8
> libs) but I don't see any difference. Any tips for debbugging are
> welcome!
> Thanks in advance!
> David
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