DMA scheduling

[Keith Whitwell]

Xavier Bestel wrote:
> On Thu, 2006-03-16 at 16:52, Keith Whitwell wrote:
> 
>> 2) Interactivity.  It is quite possible to have one application which
>>     does so little rendering per frame that it can run at 3000fps while
>>     another eg, video-based application does a lot more and can just
>>     about keep up a 30fps framerate.  Consider a situation where both
>>     applications are running at once.  Simple fairness criteria would
>>     have them running at 1500fps and 15fps respectively - but it seems
>>     that fairness isn't what is required here.  It would be preferable
>>     give the slower application a greater percentage of the GPU, so
>>     that it manages eg. 27fps, while the other is scaled down to "only"
>>     300fps or so.
> 
> What's the point of having one app run faster than the vsync when there
> is still contention on another app ? At 60Hz, having the "fast" app do
> 60fps and the slow one manage 29fps sounds better.

Of course.  I'm just trying to illustrate the concept and that was 
easier mental arithmetic...

Keith