Re: Blitter speed tests (was: smart blitter usage for scrolling)

["Antonino A. Daplas" <adaplas@gmail.com>]

On Thu, 2007-05-10 at 18:48 +0200, Krzysztof Helt wrote:
> Hi,
> 
> Below are tests of different scrolling methods for cards I have.
> 
> All tested drivers use SCROLL_REDRAW method. I forced SCROLL_MOVE 
> method by adding flag FB_READS_FAST. 
> 
> Here are some conclusions:
> Comparing two new methods: smart blitting and smart blitting with 
> merge, the merge of blits gives some speed up at lower bit 
> depths, but it is usually lost at higher ones. So we can choose 
> both ways (with or without the merge).
> 
> The smart blitting is so much faster in many cases comparing to 
> the current dump SCROLL_MOVE, that it can replace the current 
> method. For some cards it is even faster than SCROLL_REDRAW with 
> accelerated fb_imageblit().
> 
> The drivers tdfxfb and nvidiafb will benefit from switching to 
> SCROLL_MOVE method if the smart blitting is added (the tdfxfb  
> even without it). I wonder if Geforce cards also shows this speed 
> up if switched to the SCROLL_MOVE method but I have no card to 
> test.

I'll do the test for nvidia cards.




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