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

[Avi Kivity]

On 01/25/2012 10:15 PM, Gerhard Wiesinger wrote:
> 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?

What vga mode are you using?  What does the test program do?

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