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Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 1
From: |
Andreas Färber |
Subject: |
Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest |
Date: |
Fri, 26 Jul 2013 12:02:49 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 |
Am 26.07.2013 08:41, schrieb Gonglei (Arei):
>> -----Original Message-----
>> From: Anthony Liguori [mailto:address@hidden
>> Sent: Friday, July 26, 2013 11:21 AM
>> To: Gonglei (Arei)
>> Cc: address@hidden; address@hidden; Hanweidong;
>> Luonengjun; Huangweidong (Hardware)
>> Subject: Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen
>> last 13s or so for windows XP guest
>>
>> On Thu, Jul 25, 2013 at 10:08 PM, Gonglei (Arei)
>> <address@hidden> wrote:
>>> 3. Why does the traditional qemu has no blank screen problem on cirrus VGA
>> emulation ?
>>
>> This is one of the few cases where TCG is actually faster than KVM or
>> Xen. In TCG, an MMIO exit is converted to a function call. OTOH,
>> even with KVM, an MMIO exit is at least a couples thousand cycles.
>> It's worse with Xen because dom0 has to be scheduled.
>
> Perhaps I did not express clearly what I mean at #3.
> I don't understand why the qemu-dm(qemu-0.10.2) works well
> but the upstream qemu(begin with qemu-0.14) is not for the
> same windows XP guest image in cirrus vga emulation. Does
> the cirrus vga emulation have some differences between
> qemu-dm and unstream qemu ?
I don't know about qemu-dm, but QEMU switched from a home-grown pixel
handling to pixman library sometime around 1.4. CC'ing Gerd.
(And 1.5 switched the default GUI backend from SDL to GTK, which may
again show some performance differences.)
Andreas
--
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Anthony Liguori, 2013/07/25
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/25
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Anthony Liguori, 2013/07/25
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/26
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest,
Andreas Färber <=
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gerd Hoffmann, 2013/07/26
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Andreas Färber, 2013/07/26
- Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/27
- Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Pasi Kärkkäinen, 2013/07/27
- Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/29
- Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Pasi Kärkkäinen, 2013/07/29
- Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/29
Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Fabio Fantoni, 2013/07/26
Re: [Qemu-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, Gonglei (Arei), 2013/07/26