[ut2003io] Performance under Linux

Eric Lathrop eslathro at mtu.edu
Sun Oct 20 13:59:59 EDT 2002

Ok, so I compiled in MTRR support, and nothing.

[the related stuff from] lspci gives: 

00:00.0 Host bridge: Silicon Integrated Systems [SiS]: Unknown device 0651
(rev 01)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] 5591/5592 AGP
01:00.0 VGA compatible controller: nVidia Corporation NV25 [GeForce4
Ti4200] (rev a3)

/var/log/XFree86.log shows:

(II) NVIDIA(0): Verifying AGP usage for Screen 0...
(WW) NVIDIA(0): Failed to verify AGP usage

/var/log/messages gives:

kernel: agpgart: Maximum main memory to use for agp memory: 439M

I recompiled my kernel again to make agpgart only be a module, so I could
try using NvAGP. I tried different settings for NvAGP, but it still
doesn't work.

I did some searching on Google, and I don't think that there's any support
for my AGP chipset.

  --Eric Lathrop

> what chipsets are on your motherboard? (/sbin/lspci will give you a
> quick summary). make sure that agpgart can support your agp chipset, if
> not, try using NvAGP. instructions for switching between them is in the
> README provided by nvidia's 3d drivers, but the gist of it is:
> in /etc/X11/XF86Config[-4]
> add 
> Option "NvAGP" "1" 
> for NvAGP, set it to "2" for agpgart (the default is to try agpgart
> first), and if things are crashing, setting it to "0" will disable AGP,
> allowing you to at least get a working system :)
> ashridah
> ps, if you're experimenting, make sure agpgart is a module, and ISN'T
> loaded into the kernel if you're trying to use NvAGP. right after
> starting X, both dmesg's output and /var/log/XFree86.0.log should
> mention something about AGP if there are problems.

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