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[directfb-dev] Re: Success with AGP



Quoting Ville Syrj?l? (syrjala@sci.fi):
> On Wed, Jun 19, 2002 at 06:27:44AM +0200, Denis Oliver Kropp wrote:
> > I got the same values with AGP 2x, then I switched to 4x (in the BIOS):
> > 
> > Blit                                   3.01 secs (  272.34 MPixel/sec)
> > Blit colorkeyed                        3.01 secs (  272.34 MPixel/sec)
> > Blit with format conversion            3.05 secs (  120.45 MPixel/sec)
> > Blit from 32bit (alphachannel blend)   3.06 secs (  120.01 MPixel/sec)
> > Stretch Blit                           3.04 secs (  164.07 MPixel/sec)
> > Stretch Blit colorkeyed                3.04 secs (  164.07 MPixel/sec)
> 
> Here's mine with 4x. My card is a G400. I wonder why they are so
> different. Does the G550 support fast-writes? G400 doesn't so that may
> account for something.
> 
> Blit                                   3.00 secs (  281.52 MPixel/sec)
> Blit colorkeyed                        3.00 secs (  281.62 MPixel/sec)
> Blit with format conversion            3.03 secs (  108.11 MPixel/sec)
> Blit from 32bit (alphachannel blend)   3.04 secs (  107.68 MPixel/sec)
> Stretch Blit                           3.09 secs (  130.46 MPixel/sec)
> Stretch Blit colorkeyed                3.09 secs (  130.50 MPixel/sec)

It seems that the G550 has a bit faster TMU. Blended rectangles
are also faster.

It also depends on the resolution (I used 1024x768), especially
for stretched blits.

> What's next? Maybe make df_dok draw into an AGP surface so we'd see how
> much the other benchmarks suffer. Probably have to turn off the SGRAM
> stuff with this.

We need to add an option "--offscreen" to df_dok.

-- 
Best regards,
  Denis Oliver Kropp

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