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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Jul 29, 2013 at 08:48:54AM +0000, Gonglei (Arei) wrote:
> > -----Original Message-----
> > From: Pasi Kärkkäinen [mailto:pasik@xxxxxx]
> > Sent: Saturday, July 27, 2013 7:51 PM
> > To: Gerd Hoffmann
> > Cc: Andreas Färber; 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

> -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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