Re : [Qemu-devel] Re: Extremely slow graphic updates

[Sylvain Petreolle]

----- Message d'origine ----

> De : Paul Brook <address@hidden>
> À : Stefano Stabellini <address@hidden>
> Cc : address@hidden; Lennart Sorensen <address@hidden>
> Envoyé le : Mardi, 20 Janvier 2009, 19h11mn 18s
> Objet : [Qemu-devel] Re: Extremely slow graphic updates
> 
> > What is the quickest way for me to reproduce this problem?
> > Have you seen this on ppc emulation only?
> >
> > I gather that the guest is in text mode. Have you seen this in graphical
> > mode too? If yes, what was the resolution of the guest?
> 
> Steps to reproduce:
> - Start qemu (doesn't matter which target or guest OS).
> - Press c-a-2 to switch to the monitor.
> - type "help"
> - Watch the output slowly appear over the next 30 seconds
> 
> Running qemu over a forwarded X connection from a different machine (i.e. 
> ssh -X) suffers a marked slowdown. With this configuration the early x86 boot 
> stages are visibly much slower, in addition to the virtual console slowness 
> mentioned above.
> 
> The monitor virtual console, VGA text mode and the graphical mode used by the 
> knoppix bootloader[1] all show marked slowdown. It's unclear whether 
> truecolor modes are effected.
> 
> [1] I'm guessing this is either VGA 16 color or VESA 256 color mode.
> 
> > What is the resolution of your host? What X11 extensions are you using?
> 
> I have reproduced on a couple of different machines. Both are fairly standard 
> Debian sid installs, without any special Xorg config. One is x86, the other 
> x86-64, both 32-bit color depth.
> One nVidia FX5200(nv)@800x600, one ATI HD3470(radeonhd)@1600x1200.
> 
> > Do you set SDL_VIDEODRIVER anywhere?
> 
> No.
> 
> Paul
I reproduce this issue also. 
All text mode part in the guest (x86) and the monitor are awfully slow.
I am running qemu locally, no SDL_VIDEODRIVER var is set and the video card is 
a ATI X1650

 Kind regards,
Sylvain Petreolle