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

ElNormo 09-01-03 10:09 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?

Thanks

Norman

ElNormo 09-01-03 10:10 PM

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

dpw2atox 09-01-03 11:49 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 06:04 PM

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

Norman

blakeyez 09-02-03 06:18 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.

Dave

ElNormo 09-02-03 07:00 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.?

Norman

blakeyez 09-02-03 10:34 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.

Dave

ElNormo 09-03-03 12:31 AM

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?

Thanks

Norman


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