xorg running very slow problem

[John Wong <johnw@wonghome.net>]

When i use qemu-kvm-87 or qemu-kvm-0.12.1.2 or snapshot (download from
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=summary),
xorg will running very slow (the screen refresh line by line), and i
noticed the program "Xorg" will running very high cpu(>99% in top).

If i use qemu-kvm-86, xorg does not have this problem, and run just fine.

The modules is come from debian-2.6.32 kvm-intel.

The host is debian/x64/2.6.32.

I use this command to start kvm:

${KVM} -drive
file=${IMG},index=0,if=virtio,boot=on,cache=none,format=qcow2 \
-net nic,vlan=${NUM},model=virtio,macaddr=00:AA:BB:CC:DD:0${NUM} \
-net
tap,vlan=${NUM},ifname="${iface}",script=/etc/kvm/kvm-ifup,downscript=/etc/kvm/kvm-ifdown
\
-localtime -smp 2 \
-soundhw all \
-usb -usbdevice tablet \
-k en-us -monitor stdio \
-mem-path /hugepages \
-vga std -sdl \
-m 2048 -boot c

Anyone know how to solve this problem?

Please help, thank you.