[Xen-users] vga passthrough on some graphic card result in guest slow

["Jin Cui" <generalking@xxxxxxx>]

Hello,

 

I have tried vga passthrough on my open suse11.4(xen4.0.2) today. (vga card: nvidia QuadroFX5800) After enable vga passthrough, the guest VM(windows2003x64) becomes very slow for any operation including OS startup, mouse moving. And the guest's CPU utilization always keeps high(40% +), it should be consumed by windows kernel because I didn't see any process use such cpu resource from task manager. But this issue is not happen on another QuadroFX1800 machine, does vga passthrough depends on graphic hardware? since 5800 has 4G video memory but 1800 only has 768M. My guest configuration as below:

 

name="w2k3x64_2"
description="None"
uuid="dd12d5fa-57d0-9a56-8cbb-44495f9fecd3"
memory=4096
maxmem=4096
vcpus=4



localtime=1
keymap="en-us"

builder="hvm"
device_model="/usr/lib/xen/bin/qemu-dm"
kernel="/usr/lib/xen/boot/hvmloader"
boot="c"
disk=[ 'phy:/dev/lvm/win2003,hda,w',]
vif=[ 'mac=00:16:3e:7b:07:29,bridge=br0,model=rtl8139', ]
gfx_passthru=1
pci=['03:00.0']

stdvga=0
vnc=1
vncunused=1
viridian=0
usb=1
acpi=1
pae=1

usbdevice='tablet'

serial="pty"

 

Thank you,

Jin

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