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Date: Thu, 25 Aug 2011 12:51:17 +0200
From: Jan Kiszka <jan.kiszka@siemens.com>
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Subject: Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty
 logging in chain 4 memory access mode
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To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>

On 2011-08-25 12:45, Avi Kivity wrote:
> On 08/25/2011 12:21 PM, Jan Kiszka wrote:
>>>
>>>  Still slow.  I tried an old F11 image I had lying around, and -snapshot
>>>  /dev/sda, but this laptop was installed many years ago.  I'll download
>>>  some more images and try.
>>
>> You may also want to instrument vga_update_memory_access if some
>> requirement for linear mapping is not fulfilled.
>>
> 
> Plain F15 is slow.  SR2 = SR4 = 0.

So it's not using chain4 mode. Can you check what mode the adapter is
actually in and how VRAM is accessed? Likely, there is nothing we can do
about it. /me just wonders what makes F15 grub behave differently from
other distro's versions...

Jan

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