From: Felix von Leitner <leitner@convergence.de>
To: linux-kernel@vger.kernel.org
Subject: problem: reading from (rivafb) framebuffer is really slow
Date: Fri, 18 May 2001 03:29:23 +0200 [thread overview]
Message-ID: <20010518032923.A17686@convergence.de> (raw)
When benchmarking DirectFB, I found that a typical software alpha
blending rectangle fill is completely dominated (I'm talking 90% of the
CPU cycles here) by the time it takes to read pixels from the
framebuffer.
The pixels are read linearly in chunks of aligned 32-bit words. It's a
Geforce 2 GTS in 1024x768 with 32-bit color depth using rivafb. This
looks quite crass to me. Any ideas? Maybe rivafb does not initialize
AGP and the card is in PCI mode or something?
Felix
next reply other threads:[~2001-05-18 1:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-18 1:29 Felix von Leitner [this message]
2001-05-18 7:46 ` problem: reading from (rivafb) framebuffer is really slow Alan Cox
2001-05-18 18:43 ` James Simmons
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