Re: intel DQ45CB gma4500 VGA Passthrough Windows7 display deadly slow

[wealdwind <wealdwind@gmail.com>]

Thanks 

Today I tried WindowsXP domU, and I downloaded the latest intel gma4500
driver, but it seems the same problem.  Just in the while after booting
up, domU was working OK, then the system seems very slow on screen
update.

I ssh to the dom0, there was no any symptoms, no any errors log.

Would someone like to give me some instructions to switch some debug
flags on to collect the debugging log? 


I personally think that, for desktop application the VGA passthrough is
the only reason to use XEN. 

If it's not mature and and stable. I would like to use KVM which is
pretty easy to use , stable,  and almost with the same performance.


Thanks

Weald


On Thu, 2010-05-13 at 15:26 +0300, Pasi Kärkkäinen wrote:
> Adding xen-devel to CC..
> 
> -- Pasi
> 
> On Wed, May 12, 2010 at 11:33:52AM -0400, wealdwind wrote:
> > 
> > Hi,
> > 
> > I succeeded  in VGA pass through on my intel dq45cb motherboard.
> > 
> > Xen4.0.0 was downloaded from xen.org.
> > Dom0 is 2.6.32.x/stable which was downloaed form jeremy's repository.
> > Dom0 os is Ubuntu Lucid.
> > 
> > I could pass through the onboard intel GMA4500 to domU windows7. The
> > following is my hvm config:
> > 
> > kernel = "hvmloader"
> > builder='hvm'
> > memory = 1028
> > shadow_memory = 32
> > memory_sharing = 0
> > name = "win7"
> > vcpus=1
> > pae=1
> > acpi=1
> > apic=1
> > vif = [ 'type=ioemu, bridge=br0' ]
> > disk = [ 'file:/opt/virtualmachines/win7.raw,hda,w',
> > 'file:/opt/iso/win7-x86-32.iso,ioemu:hdc:cdrom,r']
> > device_model = 'qemu-dm'
> > vnc=1
> > vnclisten="0.0.0.0"
> > vncunused=1
> > vncpasswd=''
> > 
> > tsc_mode=1
> > localtime=1
> > 
> > usb=1
> > 
> > xen_platform_pci=1
> > pci=[ '01:00.0', '00:1b.0', '00:02.0','00:02.1' ]
> > gfx_passthru=1
> > 
> > 
> > 
> > Everything seems fine.  I could boot up the domU windows7. At the
> > begining  windows7 was working perfectly, but after about 1 minute
> > later, the screen display seems very slow.
> > 
> > When I clicked a menu, the menu would pop up about 20 seconds later.
> > 
> > Windows7 used the built-in  GMA4500 video driver, which is the same with
> > the driver when ran windows7 directly on the motherboard.
> > 
> > 
> > I think there must be something wrong, but I couldn't figure it out.
> > 
> > There was no error log in xend qemu-dm and windows7 event log.
> > 
> > Pls. help me.
> > 
> > Thanks
> > 
> > Weald
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
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> > Xen-users@lists.xensource.com
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