From: Antonino Daplas <adaplas@pol.net>
To: James Simmons <jsimmons@infradead.org>
Cc: Petr Vandrovec <vandrove@vc.cvut.cz>,
Dave Jones <davej@codemonkey.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Fbdev development list
<linux-fbdev-devel@lists.sourceforge.net>
Subject: Re: [Linux-fbdev-devel] Re: FBdev updates.
Date: 21 Feb 2003 06:00:53 +0800 [thread overview]
Message-ID: <1045778401.1201.17.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.44.0302201951270.20350-100000@phoenix.infradead.org>
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 0m2.500s
bpp16
-----
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
next prev parent reply other threads:[~2003-02-20 21:50 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-20 1:09 FBdev updates James Simmons
2003-02-20 1:17 ` Jeff Garzik
2003-02-20 1:22 ` James Simmons
2003-02-20 15:02 ` Dave Jones
2003-02-20 15:07 ` James Simmons
2003-02-20 18:29 ` Petr Vandrovec
2003-02-20 19:03 ` Jurriaan
2003-02-20 19:58 ` James Simmons
2003-02-20 22:00 ` Antonino Daplas [this message]
2003-02-21 9:09 ` [Linux-fbdev-devel] " Geert Uytterhoeven
2003-02-21 10:46 ` Antonino Daplas
2003-02-21 11:02 ` Geert Uytterhoeven
2003-02-21 1:45 ` David S. Miller
2003-02-21 9:04 ` [Linux-fbdev-devel] " Geert Uytterhoeven
2003-02-21 0:24 ` Antonino Daplas
2003-03-03 20:35 ` Petr Vandrovec
2003-03-03 21:25 ` Geert Uytterhoeven
2003-03-03 21:32 ` Antonino Daplas
2003-03-05 20:23 ` James Simmons
2003-03-06 1:18 ` Antonino Daplas
2003-03-04 21:29 ` Jurriaan
2003-03-04 21:46 ` Petr Vandrovec
2003-03-09 21:29 ` Petr Vandrovec
2003-03-09 22:27 ` Antonino Daplas
2003-03-09 22:54 ` Petr Vandrovec
2003-03-09 23:44 ` Antonino Daplas
2003-03-11 15:31 ` James Simmons
2003-03-05 20:22 ` James Simmons
2003-03-06 7:35 ` Sven Luther
2003-03-06 8:05 ` Antonino Daplas
2003-03-06 8:25 ` Sven Luther
2003-03-28 14:19 ` 2.5.66 fbdev performance (was Re: Re: FBdev updates) Petr Vandrovec
2003-03-28 18:50 ` [Linux-fbdev-devel] " Antonino Daplas
2003-02-20 15:10 ` FBdev updates Ivan Kokshaysky
-- strict thread matches above, loose matches on Subject: below --
2003-03-05 20:31 [Linux-fbdev-devel] " Petr Vandrovec
2003-03-04 21:53 Petr Vandrovec
2002-06-05 16:50 fbdev updates Russell King
2002-06-05 17:21 ` [Linux-fbdev-devel] " James Simmons
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