> -----Original Message----- > From: Fabio Fantoni [mailto:fabio.fant...@m2r.biz] > Sent: Thursday, July 25, 2013 9:55 PM > To: Gonglei (Arei) > Cc: qemu-devel@nongnu.org; xen-de...@lists.xen.org; Hanweidong; > Luonengjun; Huangweidong (Hardware) > Subject: Re: [Xen-devel] Cirrus VGA slow screen update, show blank screen last > 13s or so for windows XP guest > > Il 25/07/2013 15:13, Gonglei (Arei) ha scritto: > > 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-de...@lists.xen.org > > http://lists.xen.org/xen-devel > I've seen the perfomance problem too with vnc when I started to try > upstream qemu. I already reported it on the end of 2011 but no solution yet. > I found spice as an alternative: qxl vga will not work on xen until SSE > support will be added on hvm domU, but spice is usable with stdvga and > performance is better that vnc. Combined with vdagent and usb > redirection it makes a perfect vkvm, and more. > Spice basic support in xl is already present and for more features I > posted some patches here but they are not included in upstream for now. > Cirrus vga drivers are also old and have limitations on both windows and > linux and they can add other problems, they are probably not good for > recent os/de.
Thanks for responding. I don't understand why the Qemu-dm works well but the upstream qemu is not for the same windows XP guest image. Does the Cirrus vga emulation have some differences between qemu-dm and unstream qemu ? -Gonglei
