Miroslav Petricek wrote:
> If there's two adresses in the startup log, do "cat /proc/pci" and
> look for that one, which is marked as "prefetchable".
>
> write:
> VRAM adress VRAM size
> V V
> echo "base=0xe0000000 size=0x400000 type=write-combining" > /proc/mtrr
>
> Then do cat /proc/mtrr and check if that works.
>
> Of course, You must have mtrr support compiled in.
I did exactly this, with no performance benefit. Actually, I first set
it to the wrong, non-prefetchable, bank, and got a weird display. It
still worked well enough for me to gracefully close the X session :-).
Anyway, is there a good way to find out if the MTRR is helping
performance? I think that X11perf is very processor intensive, and
that's masking the MTRR benefits on a dual 500 machine.
Thanks for your help,
Mordy
--
o Mordy Ovits
o Cryptographic Engineer
o LockStar, Inc.
--
There are two kinds of fool; One who says "This is old
and therefore bad," and one who says "This is new and
therefore better." -- John Brunner
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