Hi Gerd,

Try to reproduce this bug in:
kernle
2.6.32-303.el6.x86_64
qemu-kvm
qemu-kvm-0.12.1.2-2.312.el6.x86_64
spice
0.10.1

steps:
1 boot win8 guest
2 enter "Startup Settings" screen and click "Restart"
3 Windows 8 then reveals its brand new Startup Settings screen. Press F3 key to Enable low-resolution video.

Results:
the mouse pointer on the desktop move smooth

plus: Could not fould win8 in winPcap supported platform.

> Results:
> the mouse pointer on the desktop move smooth

Maybe it isn't noticable when running qemu-kvm and spice client on the same machine.  I have a ethernet connection (100 mbit) between them where it is noticable.

(In reply to comment #7)
> > Results:
> > the mouse pointer on the desktop move smooth
> 
> Maybe it isn't noticable when running qemu-kvm and spice client on the same
> machine.  I have a ethernet connection (100 mbit) between them where it is
> noticable.

yes, it was affected with network environment, It isn't noticable on my host, but reproduced on another mechine.

btw, How do you run wireshark on win8 platform, I try run it, but install winPcap failed. could you give me a detail steps? thanks.

I run wireshark on the linux machine where the spice client runs on.
Then:

 (1) start capture on the ethernet interface,
 (2) go to menu -> statistics -> io graph.
 (3) filter by spice port @ host, I'm using this for my setup:
     ip.host == "xeni" && tcp.port == 5906

Gives a nice real-time graph of the network load created by spice.
Then start using the win8 guest & watch the graph.

patches posted.

Reproduced this issue with the same steps in Comment 10 on qemu-kvm-0.12.1.2-2.316.el6.

Steps:
1. Boot a guest with spice+vga on host A.

 /usr/libexec/qemu-kvm -M rhel6.4.0 -cpu Conroe -m 2048 -smp 2,sockets=2,cores=1,threads=1 -enable-kvm -name win7 -uuid feebc8fd-f8b0-4e75-abc3-e63fcdb67170 -smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 -k en-us -rtc base=utc,clock=host,driftfix=slew -no-kvm-pit-reinjection -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device usb-tablet,id=input0 -drive file=/home/win7-64-virtio.qcow2,format=qcow2,if=none,cache=none,werror=stop,rerror=stop,id=test -device ide-drive,bus=ide.0,unit=1,drive=test,id=ide0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,id=hostnet0,vhost=on -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:23:AE:7A:6E:10,bus=pci.0,addr=0x5  -monitor stdio -qmp tcp:0:6666,server,nowait -boot c -bios /usr/share/seabios/bios-pm.bin -chardev socket,path=/tmp/isa-serial,server,nowait,id=isa1 -device isa-serial,chardev=isa1,id=isa-serial1 -drive if=none,id=drive-fdc0-0-0,readonly=on,format=raw -global isa-fdc.driveA=drive-fdc0-0-0 -spice port=5930,disable-ticketing -vga std

2. Open guest desktop on host B
#spicec -h $host_A_IP -p 5930

3.install and run wireshark on host B, start capture on the ethernet interface
#yum install wireshark && wireshark-gnome
#wireshark

4.go to menu -> statistics -> io graph.
filter by spice port @ host
     ip.host == "ip.host_A" && tcp.port == 5930

5.move the mouse pointer on desktop

Result:
1. Mouse pointer on the desktop moves are snappier.
2. Produce spikes in the graph by moving around the mouse pointer
and bandwidth is nearly 5000.

Verified on qemu-kvm-0.12.1.2-2.323.el6 with the same steps.

Result: 

1. Mouse pointer moves are smooth.
2. Wireshark graph shows the bandwidth lower than 1000，curve were running smoothly.

So, this bug is verified pass.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0527.html