Re: performance notes

["Michel Dänzer" <daenzer at debian dot org>]

On Tue, 2004-11-23 at 16:44 +0100, Robert Fendt wrote:
> - Memory matters. No, I do not mean the ATI card's memory. Your RAM. I
> (finally) switched my system from SDRAM to DDR yesterday (due to apparent
> stability issues of the mainboard using SDRAM). While it is virtually the
> same using Windows, it is a huge difference using fglrx. I do not know
> why, though.

Not sure, but I guess it can make a difference for AGP transfers.


>  	Option		"DRM_nbufs"		"100"
> 	Option		"DRM_bufsize"	"65536"
> 	Option		"RingSize"		"32"
>
> While this does not improve the frame  rate directly, it does seem to
> improve its stability due to larger buffers. It renders UT2004 'onslaught'
> mode (barely) playable, for example, since the slumps in frame rate are
> less bad. Be careful with RingSize, though. It is in megabytes, so you
> probably should use a somewhat smaller value depending on available video
> memory size.

These values have nothing to do with video RAM but with GART (i.e.
ultimately system) memory. FWIW, I doubt that increasing the ring buffer
size beyond the default of 1 MB provides any real benefit.


-- 
Earthling Michel Dänzer      |     Debian (powerpc), X and DRI developer
Libre software enthusiast    |   http://svcs.affero.net/rm.php?r=daenzer