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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 12:27:30 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 |
Am 26.07.2013 12:19, schrieb Gerd Hoffmann:
> On 07/26/13 12:02, Andreas Färber wrote:
>> 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.
>
> 0.14 != 1.4 ;)
Oops! In that case, Gonglei, try to reproduce the issue with upstream
0.10 and use git-bisect to find out when things got slower between
v0.10.2..v0.14.0. It would be unrealistic to expect us to remember all
Cirrus-related changes from 2-4 years ago. ;)
Andreas
--
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
- Re: [Qemu-devel] [Xen-devel] Cirrus VGA slow screen update, show blank screen last 13s or so for windows XP guest, (continued)
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, 2013/07/26
- 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 <=
- 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