[Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest

["Gonglei (Arei)" <arei.gonglei@xxxxxxxxxx>]

Hi,
  I found a problem: For windows XP guest booting by qemu upstream, 
using the RDP(Remote Desktop Protocol) and VNC protocol to connect the windows 
XP guest 
which booting by Qemu upstream respectively. the VNC client will become blank 
screen last 
13 seconds or so on XEN platform, and last 2 seconds on KVM. And through 
debugging, 
the cirrus VGA card does not produce dirty pages during the blank screen's 
times.
        
  When -vga is changed from cirrus to std the issue goes away and the update 
proceeds at normal speed.  
In addition, when using the Qemu-dm replace Qemu upstream on XEN platform,
the cirrus VGA works good and the issue goes away also.
        
  Today, lots of googling have seen the same behavior: 
        
https://github.com/joyent/smartos-live/issues/215
http://lists.gnu.org/archive/html/qemu-devel/2011-06/msg02105.html
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=574988
etc...
        
  But, I test the latest qemu-1.5.1, the problem exist firmly.
        
  Any ideas? Thanks!
        
Best Regards!
-Gonglei
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel