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

From: "Gonglei (Arei)" <arei.gonglei@huawei.com>
To: "Pasi Kärkkäinen" <pasik@iki.fi>
Cc: "aliguori@us.ibm.com" <aliguori@us.ibm.com>,
	Hanweidong <hanweidong@huawei.com>,
	"Ian.Jackson@eu.citrix.com" <Ian.Jackson@eu.citrix.com>,
	Luonengjun <luonengjun@huawei.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	"Gerd Hoffmann" <kraxel@redhat.com>,
	"Anthony Liguori" <anthony@codemonkey.ws>,
	"Andreas Färber" <afaerber@suse.de>,
	"Huangweidong (Hardware)" <huangweidong@huawei.com>
Subject: Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest
Date: Tue, 30 Jul 2013 02:01:22 +0000	[thread overview]
Message-ID: <33183CC9F5247A488A2544077AF190207EF78691__45473.485455341$1375149891$gmane$org@szxeml538-mbs.china.huawei.com> (raw)
In-Reply-To: <20130729105810.GR2924@reaktio.net>

> On Mon, Jul 29, 2013 at 08:48:54AM +0000, Gonglei (Arei) wrote:
> > > -----Original Message-----
> > > From: Pasi Kärkkäinen [mailto:pasik@iki.fi]
> > > Sent: Saturday, July 27, 2013 7:51 PM
> > > To: Gerd Hoffmann
> > > Cc: Andreas Färber; Hanweidong; Luonengjun; qemu-devel@nongnu.org;
> > > xen-devel@lists.xen.org; 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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