Re: [Qemu-devel] [PATCH] kvm: flush the dirty log when unregistering a slot

[Gerhard Wiesinger <lists@wiesinger.com>]

On Sun, 15 Jan 2012, Avi Kivity wrote:

> On 01/15/2012 04:40 PM, Gerhard Wiesinger wrote:
>> On Sun, 15 Jan 2012, Jan Kiszka wrote:
>>
>>> On 2012-01-15 15:17, Avi Kivity wrote:
>>>> Otherwise, the dirty log information is lost in the kernel forever.
>>>>
>>>> Fixes opensuse-12.1 boot screen, which changes the vga windows rapidly.
>>>
>>> Confirmed, problems solved here.
>>
>> Problem from: http://permalink.gmane.org/gmane.comp.emulators.qemu/131853
>>
>> Confirmed to be fixed, too. Long awaited patch :-)
>
> Sorry, I forgot about that.  Please ping me if I do that.
>
>>
>> BTW: There is also a major difference in video performance:
>> 1.) With Patch: 1400MB/s (MByte/s)
>> 2.) Without Patch: 6MB/s
>>
>> Any reason for that?
>
> What are you measuring exactly?

I'm measuring VGA video performance under DOS with own written test 
program.

What's strange, new findings: Measurement doesn't depend on the patch. 
Sometimes it is high sometimes low. I think I have to investigate further.

Any ideas?

BTW: Please merge the patch into qemu-kvm repository.

Ciao,
Gerhard

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