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-   -   Perhaps a problem with AGPGART? (http://www.nvnews.net/vbulletin/showthread.php?t=17348)

ElNormo 09-01-03 09:09 PM

Perhaps a problem with AGPGART?
I've been struggling to figure out why my RH9 desktop seems so sluggish, especially compared to similar boxes with comparable graphics cards. I stumbled upon an interesting message in the output of dmesg:

0: nvidia: loading NVIDIA Linux x86 nvidia.o Kernel Module 1.0-4496 Wed Jul 16 19:03:09 PDT 2003
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 816M
agpgart: unsupported bridge
agpgart: no supported devices found.
0: NVRM: AGPGART: unable to retrieve symbol table

Admittedly, I'm not entirely sure what agpgart is, but this certainly looks suspicious. Any ideas?



ElNormo 09-01-03 09:10 PM

FYI, this is a Geforce4 MX chipset, as bundled with the Shuttle SN41G2.

dpw2atox 09-01-03 10:49 PM

upgrade your kernel. Kernel 2.4.22 has more AGP GART modules then previous kernels including support for nforce2 agp.

ElNormo 09-02-03 05:04 PM

Thanks for the tip... should this produce a noticeable improvement? I'll give it a shot first thing tomorrow morning.


blakeyez 09-02-03 05:18 PM

Patch works as well
nVidia provides a patch with the nForce(2) drivers for audio/network that adds agpgart support for kernel 2.4.20 as well. That's what I use on my SN41G2.


ElNormo 09-02-03 06:00 PM

As I recall, I never could get the patch to install correctly. Thanks for the tip though. Do you notice performance issues, namely, 2D sluggishness. Such as resizing windows, moving windows, etc.?


blakeyez 09-02-03 09:34 PM

Nope, no problems at all... The patch installed fine for me first try; what kernel sources are you using again? I use gentoo-sources (2.4.20) and it patched fine and made the option for the nforce agp chipset available in my kernel configuration.


ElNormo 09-02-03 11:31 PM

I just finished trying to compile the 2.4.22 sources from kernel.org, with no success. I got them to install, but had a horrid time running them. I obviously didn't configure it correctly; and even then, the AGPGART stuff didn't start correctly. I got the same error messages. I rolled back to the 2.4.20-18.9 kernel I already had running.

I am using the stock RedHat kernels. I realize this probably contributed to my less-than-successful attempt to get 2.4.22 running.

I've read that the nVidia patch does not work right for the RedHat kernel sources, is this true? I had tried at one point, but couldn't get it to work correctly. Perhaps I'll try again.

Interestingly enough, if I look at /proc/sys/nvidia/agp/status (i don't have the exact path handy...), it says AGP is running. If this is so, what exactly does AGPGART do?



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