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SubjectRe: MTRR and AGP graphic cards, two regions, exclusions
Thanks Jarno!

This works GREAT.

Before the write-combining x11perf -ellipse500:
50000 reps @ 0.1062 msec ( 9420.0/sec): 500-pixel ellipse
With write-combining x11perf -ellipse500:
80000 reps @ 0.0661 msec ( 15100.0/sec): 500-pixel ellipse
Cool.

--
Jeffrey Hundstad


On 8 Jul, Jarno Paananen wrote:
> Jeffrey Hundstad <jeffrey.hundstad@mankato.msus.edu> writes:
>
> | If I've read recent posts correctly there should also be an entry to
> | make the video writes be combined, correct? It seems that my card has
> | Region 0 and Region 1, I suppose graphic and texture areas (see
> | below). Which should I use? Both?
>
> In TNT region 0 is control registers, region 1 frame buffer.
>
> | Should it be (I don't believe this is correct):
> |
> | echo "base=0xf5000000 size=0x1625600 type=write-combining" >! /proc/mtrr
> |
> | Also recently there was a post about excluding caching from I/O and
> | non-used areas. How are these determined?
>
> No, the size is in hexadecimal and you should apply this to region 1, ie.:
>
> echo "base=0xfc000000 size=0x1000000 type=write-combining" >! /proc/mtrr
>
> You don't have to exclude anything as you are not changing the
> control register region 0 in any way and it remains uncached as
> it should be.
>
> // Jarno



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