[vdr] Re: Softdevice + EPIA-M / Sound resampling

[Richard Jones <richard@earthmen.com>]

On Mon, 2004-02-02 at 08:41, Teemu Suikki wrote:
> On Sun, 1 Feb 2004, Colin Paton wrote:
> 
> > Playing back with blit added (get video display) = ~78% CPU
> > Playing back with blit + FB sync = ~98% CPU
> 
> Looks like the FB sync is done with busylooping.. :/ is this in DirectFB
> or viafb or somewhere else? Most VGA chips can generate a interrupt at
> VSync, wait should be possible using that..
> 


I'm not familiar with the DirectFB code for your particular chipset
but the DFB matrox code falls back to polling the vertical position to
perform VBlank flips when running on a kernel without support for the matrox
vsync interrupt (I believe the last couple of 2.4.x kernels had built in 
support for the vsync interrupt). 

Regards,
Richard.




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