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SubjectRe: activating mttr on voodoo 3
Date
Hi,

I seems that 'lspci -v' reports a 32MB pre-fetchable window of memory, not
16MB for the hardware.
This is with a 3dfx Voodoo3 3000 AGP, kernel version 2.3.49.

Any ideas?
__________________________
Daniel J Blueman
Undergraduate - BSc Computing Science
UMIST university - Manchester
Direct line: 0161 933 3569
Mobile: 07775 583766
Email: daniel.j.blueman@stud.umist.ac.uk
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----- Original Message -----
From: "Phil DeBecker" <debecker@iglou.com>
To: <linux-kernel@vger.rutgers.edu>
Cc: <cataldo@essi.fr>
Sent: Friday, March 03, 2000 6:03 PM
Subject: Re: activating mttr on voodoo 3


>
> >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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