[directfb-dev] Re: [PATCH] Preliminary AGPONLY support

[Ville Syrjälä <syrjala@sci.fi>]

On Wed, Dec 11, 2002 at 08:22:46PM +0100, Denis Oliver Kropp wrote:
> How fast is your CPU/Memory?

600 MHz Duron / PC133 SDRAM.

> > vid-vid
> > Blit                                           3.02 secs (  308.15 MPixel/sec)
> 
> HW (normal value)
> 
> > sys-vid
> > Blit                                           3.09 secs (   67.91 MPixel/sec)
> 
> SW (seems too slow, but may be correct for 32bit)

I'm testing @ 16bit.

> > agp-vid
> > Blit                                           3.01 secs (  280.50 MPixel/sec)
> 
> HW (seems normal)

Yes. Over 4 times sys-vid ;)

> > vid-agp
> > Blit                                           3.04 secs (  131.50 MPixel/sec)
> 
> HW (may be normal, but I'm wondering why it's slower than the previous one)

Me too. For some reason the card can't write to AGP very fast.

> > sys-agp
> > Blit                                           3.02 secs (  175.89 MPixel/sec)
> 
> SW (seems normal, but should be as fast as sys-sys)

Perhaps the difference is due to write-combining.

> > agp-agp
> > Blit                                           3.01 secs (   91.44 MPixel/sec)
> 
> HW (seems normal)

I'm wondering why it's so much slower than vid-agp.

> > vid-sys
> > Blit                                           3.04 secs (  136.04 MPixel/sec)
> 
> SW (way too fast, should be around 10 MPixel)

My bad. I was using VIDEOLOW surfaces. I get 5.52 MPixel/sec with
VIDEOONLY.

> > sys-sys
> > Blit                                           3.02 secs (  136.94 MPixel/sec)
> 
> SW (seems normal)
> 
> > agp-sys
> > Blit                                           3.65 secs (    8.98 MPixel/sec)
> 
> SW (way too slow, should be as fast as sys-sys)

Well AFAIK the AGP memory is non-cacheable but still. It's not much faster
than vid-sys. Not good at all. I'll have to code a small agpgart only test
app and see if I can reproduce these results...

> > Totally weird stuff.
> 
> Maybe you mixed up agp/vid somewhere in the software locking?

I don't see any errors in the code. Perhaps I'm just blind or something.
We'll see after I try it with just agpgart.

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/


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