Messages in this thread | | | Date | Fri, 3 Mar 2000 13:03:33 -0500 (EST) | From | Phil DeBecker <> | Subject | Re: activating mttr on voodoo 3 |
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>I putted the first address in /proc/mtrr (under 2.3.48), restarted X, and >after 3 seconds up, I had a system freeze and had to do a hard ( button) >reboot.
>Am I doing the procedure wrong, or is mtrr broken (It didn't compile >in 2.3.47).
It's fixed now, and even in 2.3.47 it was just due to a typo. The MTRR stuff works great, but in fact you are doing it wrong :)
The X server memory range thing shows both the non-prefetchable range and the prefetchable range ; the second one is actually the range you want to use. To be sure, cat /proc/pci which will explicitly tell you which is which.
I have a V3 3000; assuming your memory ranges are like mine, you'd enter the following:
echo "base=0xfc000000 size=0x1000000 type=write-combining" > /proc/mtrr
This will yield (in /proc/mtrr):
reg00: base=0x00000000 ( 0MB), size= 128MB: write-back, count=1 reg01: base=0xfc000000 (4032MB), size= 16MB: write-combining, count=1
There is a noticeable speedup in 2-D when you use this ; I don't think 3-D is affected though.
Phil D.
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