Re: [PATCH 0/6] In kernel PIT patch

[Anthony Liguori <anthony@codemonkey.ws>]

Avi Kivity wrote:
>
>> The thing I'm trying to get at is a quantitative statement about why 
>> moving the pit into the kernel is the right thing.  I'll try to give 
>> the patches a try myself in the next couple of days.  I don't think 
>> it's obvious that it's the right thing to do without some sort of 
>> benchmark supporting it.
>>   
>
> Playing a movie is better than any benchmark; it reflects actual user 
> experience in a real and important use case.  Benchmarks are 
> substitutes for real use cases, not the goal of the optimization.

I tried out WinXP with the standard HAL and the in-kernel APIC patches.  
I did not see any appreciable improvement in multimedia playback (video 
or audio).  I still get the same amount of jitters.  I've tried with and 
without -tdf too.

So far, the smoothest play back I've gotten is using the ACPI HAL.  Can 
you point to a particular example where you see an improvement?  Perhaps 
a divx or movie trailer that is better with it than without it?

Regards,

Anthony Liguori



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