On Sun, Sep 17, 2006 at 08:33:37PM +0300, Heikki Lindholm wrote:
> The included patch makes dfb:mgatv use YV12 colourspace for video and
> the hardware subpicture layer for OSD. The patch is a prime example of
> bad goal-oriented programming, but does what I wanted: improves
> performance to the level that my 450 MHz P2 can now function as a DVB
> box like no underpowered P2 has done before! Unfortunately, the patch
> probably breaks everything else, but I'm too lazy to clean it up.
I'm very much interested in this.
You didn't get rid of the CPU-burning Flip() calls, did you? At least
on my system, DirectFB spends about 10% of the CPU cycles waiting for
MGA engine ready. Adding a usleep(2000) right before the Flip() call
reduces the CPU load but risks dropping frames. I believe it would be
much more efficient if the Flip() method blocked the thread until the
hardware is ready. That would require some new ioctl() in the kernel.
Marko
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