1-0-8756 - No /proc/driver/nvidia/agp?

[89TROOPER]

According to the readme, I should have this in /proc. I'm trying to confirm that I'm using NvAgp and not AGPGART (registry says NvAgp=1...). Should I have the agp directory?

[Zhenech]

$ ls /proc/driver/nvidia/agp/
card host-bridge status

$ cat /proc/driver/nvidia/agp/status
Status: Enabled
Driver: AGPGART

dunno how it is with nvagp, but assume Driver should be set to it...

[zander]

@89TROOPER: this directory only exists if you have an AGP GPU.

[bugger]

... what if I have a PCI Express card (Geforce 6200TC)? Does the direcectory exist, though?

[zander]

@bugger: no, if you have a PCI Express GPU, the directory shouldn't be created/populated.

[bugger]

cheers zander. Does it mean that I can disable (nvAGP "0") and unload the agpgart.ko module?

[zander]

@bugger: the NvAGP option won't have an effect on your system; if you wish to eliminate the dependency on agpgart.ko, you can rebuild your kernel w/o AGPGART support and reinstall the NVIDIA kernel module, though.

[89TROOPER]

Originally Posted by bugger

cheers zander. Does it mean that I can disable (nvAGP "0") and unload the agpgart.ko module?

I tried disabling AGP in the kernel. Even with the CONFIG_AGP=n, when I do a make, it gets changed to =m. The only option with an make xconfig is Y or M. Maybe there's some sort of "AGP compatibility layer" even though the card is PCI-E? Can't unload the module because it's in use by nvidia (and intel_agp on my system if it's loaded).

[zander]

@89TROOPER: yes, CONFIG_AGP may be pulled in as a dependency; please note it's perfectly safe to have agpgart.ko loaded on Linux 2.6, the module doesn't implement any backend drivers.

[dsorkin]

I'm trying to address some stability issues, the 8756 driver documentation makes reference to AGP as a potential cause in Appendix F. Is unloading the AGPGART module a logical next step?

dsorkin@gwar:share> cat /proc/driver/nvidia/cards/0
Model: GeForce 6800 XT
IRQ: 16
Video BIOS: 05.41.02.47.00
Card Type: PCI-E
DMA Size: 39 bits
DMA Mask: 0x7fffffffff

/proc/driver/nvidia/version
NVRM version: NVIDIA Linux x86 Kernel Module 1.0-8756 Wed Mar 29 14:26:26 PST 2006
GCC version: gcc version 4.0.3 (Debian 4.0.3-1)



Thanks,
David Sorkin

[bugger]

@89TROOPER: you need to disable K8 GART first; then you can get rid of the agpgart.ko module.
Processor type and features --->
[] K8 GART IOMMU support
Device Drivers --->
Character devices --->
< > /dev/agpgart (AGP Support)

I tried both with and without agpgart.ko. As zander already mentioned earlier - there is no difference. The game gl-117 shows around 60 fps without composite (6200TC, Twinview) - I guess it's a bit lame.

[89TROOPER]

Originally Posted by bugger

@89TROOPER: you need to disable K8 GART first; then you can get rid of the agpgart.ko module.
Processor type and features --->
[] K8 GART IOMMU support
Device Drivers --->
Character devices --->
< > /dev/agpgart (AGP Support)

I tried both with and without agpgart.ko. As zander already mentioned earlier - there is no difference. The game gl-117 shows around 60 fps without composite (6200TC, Twinview) - I guess it's a bit lame.

Hmm..couldn't find GART_IOMMU in the .config...I won't worry about it if it doesn't matter.