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

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

> On Mon, Jul 29, 2013 at 08:48:54AM +0000, Gonglei (Arei) wrote:
> > > -----Original Message-----
> > > From: Pasi KÃrkkÃinen [mailto:pasik@xxxxxx]
> > > Sent: Saturday, July 27, 2013 7:51 PM
> > > To: Gerd Hoffmann
> > > Cc: Andreas FÃrber; Hanweidong; Luonengjun; qemu-devel@xxxxxxxxxx;
> > > xen-devel@xxxxxxxxxxxxx; Gonglei (Arei); Anthony Liguori; Huangweidong
> > > (Hardware)
> > > Subject: Re: [Xen-devel] [Qemu-devel] Cirrus VGA slow screen update, show
> > > blank screen last 13s or so for windows XP guest
> > >
> > > On Fri, Jul 26, 2013 at 12:19:16PM +0200, Gerd Hoffmann wrote:
> > > >
> > > > Maybe the xen guys did some optimizations in qemu-dm which where not
> > > > merged upstream.  Try asking @ xen-devel.
> > > >
> > >
> > > Yeah, xen qemu-dm must have some optimization for cirrus that isn't in
> > > upstream qemu.
> >
> > Hi, Pasi. Would you give me some more details? Thanks!
> >
> 
> Unfortunately I don't have any more details.. I was just assuming if xen
> qemu-dm is fast,
> but upstream qemu is slow, there might be some optimization in xen
> qemu-dm ..
> 
> Did you check the xen qemu-dm (traditional) history / commits?
> 
> -- Pasi

Yes, I did. I tried to reproduce the issue with qemu-dm by fall backing history 
commit.
But the qemu-dm mainline merged other branches, such as branch 'upstream' and 
branch 'qemu',
so that I can not complied the xen-4.1.2/tools project well. CC'ing Ian and 
Anthony.

-Gonglei

> 
> > -Gonglei
> >
> > > > Beside that the standard vga usually is the better choice anyway as it
> > > > supports more video memory and higher resolutions than cirrus.
> > > >
> > >
> > > One of the reasons to use emulated Cirrus is that there's a KMS driver 
> > > for it.
> > > Is there one for the emulated stdvga adapter?
> > >
> > > -- Pasi
> >
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