On Fri, 2003-02-21 at 03:58, James Simmons wrote:
>
> > I was for five weeks in U.S., so I did not do anything with
> > matroxfb during that time. I plan to use fillrect and copyrect
> > from generic code
>
> I have ported the accelerated functions to the new api. What is left is to
> deal with the loadfont and putcs issue which I'm working on the code right
> now.
>
> > (although it means unnecessary multiply on
> > generic side, and division in matroxfb,
>
> ????
>
> > but well, if we gave
> > up on reasonable speed for fbdev long ago...).
>
> This is not true. Several benchmarks have shown a large performance
> improvement in 2.5.X.
>
2.5.x might be a bit slower with bpp8 but at higher color depths is
significantly faster. And this is done with a single generic color
exapnd function that replaces the entire fbcon-cfb*.c in 2.4. And it
will theoretically still draw correctly whatever the condition is (any
bpp from 1-32, unaligned origin, pitch, width, etc).
Drivers with accelerated color expansion, if done correctly, _should_
perform better whatever the color depth.
However, using fonts with widths not divisible by 8 will be several
folds slower. This should be helped if we add some form of tile/texture
blitting support to fbdev.
Note: I cannot test with 12x22 fonts in 2.4 because some/most drivers do
not support it.
Tony
no accel
scrollmode: yredraw
font: 8x16
visual: packed pixels
time cat /usr/src/linux/MAINTAINERS
linux-2.4.20
bpp8
---- real 0m2.499s user 0m0.000s sys 0m2.500sbpp16 ----- real 0m8.324s user 0m0.000s sys 0m8.320s
bpp24 ----- real 0m12.364s user 0m0.000s sys 0m12.370s
bpp32 ----- real 0m16.274s user 0m0.000s sys 0m16.280s
linux-2.5.62
bpp8 ---- real 0m2.557s user 0m0.003s sys 0m2.553s
bpp16 ----- real 0m4.051s user 0m0.002s sys 0m4.050s
bpp24 ----- real 0m9.520s user 0m0.000s sys 0m9.520s
bpp32 ----- real 0m7.496s user 0m0.002s sys 0m7.494s
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This archive was generated by hypermail 2b29 : Sun Feb 23 2003 - 22:00:31 EST