Messages in this thread | | | From | "Daniel J Blueman" <> | Subject | Re: activating mttr on voodoo 3 | Date | Fri, 3 Mar 2000 18:47:12 -0000 |
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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 SMS: daniel.j.blueman@sms.genie.co.uk ----- 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. > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/
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