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Date: Thu, 6 Sep 2001 08:18:43 +0200
From: Peter Surda <shurdeek@panorama.sth.ac.at>
To: linux-kernel@vger.kernel.org
Subject: (solved) memcpy to videoram eats too much CPU on ATI cards
Message-ID: <20010906081842.D27619@shurdeek.cb.ac.at>
In-Reply-To: <E15bRy4-0004Va-00@the-village.bc.nu> <200108272140.XAA20798@cave.bitwizard.nl> <20010828000127.M17545@shurdeek.cb.ac.at>
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In-Reply-To: <20010828000127.M17545@shurdeek.cb.ac.at>; from shurdeek on Tue, Aug 28, 2001 at 12:01:27AM +0200
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On Tue, Aug 28, 2001 at 12:01:27AM +0200, Peter Surda wrote:
> So the conclusion is basically that the card can't chew data that fast an=
d I
> should use busmastering instead of memcpy (and other drivers should do th=
at
> too because "hidden load" occurs anyway). I'm working on it.
Just to end this thread in a victorous manner ;-), thanks to Michel D=E4nzer
<michdaen@iiic.ethz.ch> and me, there is now a working implementation of
busmastered video transfers for the r128 driver, and it has been submitted =
to
all relevant lists and maintainers. It indeed solved the problem, CPU time
eaten by video transfers is negligible and DVD and "DivX ;-)" playback was
never so smooth. With software-only DVD decoder, watching fullscreen DVD
leaves 50-60% CPU time idle on a Duron 650, even on action-packed scenes. If
I catch someone claiming again that Linux isn't suitable for multimedia, I =
can
just laugh now :-).

Bye,

Peter Surda (Shurdeek) <shurdeek@panorama.sth.ac.at>, ICQ 10236103, +436505=
122023

--
               Dudes! May the Open Source be with you.

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