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pigeon · 02-02-13, 10:42 PM

Hi,

I have a GTX 460 using the 310.19 driver.

I'm trying to use it without PAT support. I'm loading the nvidia kernel module driver with NVreg_UsePageAttributeTable=0

From the kernel messages I can see:

Code:

[   94.534963] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  310.19  Thu Nov  8 00:52:03 PST 2012
[   94.535125] NVRM: builtin PAT support disabled, falling back to MTRRs.
[  126.927848] NVRM: GPU at 0000:01:00: GPU-2d2df840-6445-2af1-fc01-00f7c8346757

However, it doesn't seem to be using MTRR, at least I do not see any new MTRR entries in /proc/mtrr after the driver is loaded or after X has started. (I'm expecting to see some new write-combining MTRR region created)

And without PAT and MTRR, 3D performance is dreadful (3-4fps)

Is there something that can be done here?

Thanks.

02-02-13, 10:42 PM	#1
pigeon Registered User Join Date: Jul 2004 Posts: 57	MTRR support in recent driver/card? Hi, I have a GTX 460 using the 310.19 driver. I'm trying to use it without PAT support. I'm loading the nvidia kernel module driver with NVreg_UsePageAttributeTable=0 From the kernel messages I can see: Code: [ 94.534963] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 310.19 Thu Nov 8 00:52:03 PST 2012 [ 94.535125] NVRM: builtin PAT support disabled, falling back to MTRRs. [ 126.927848] NVRM: GPU at 0000:01:00: GPU-2d2df840-6445-2af1-fc01-00f7c8346757 However, it doesn't seem to be using MTRR, at least I do not see any new MTRR entries in /proc/mtrr after the driver is loaded or after X has started. (I'm expecting to see some new write-combining MTRR region created) And without PAT and MTRR, 3D performance is dreadful (3-4fps) Is there something that can be done here? Thanks. __________________ Geforce 6600 256MB RAM Geforce Go 7400 256MB RAM Geforce 9300M GS 256MB RAM (ASUS N10J) ION 512MB RAM (Acer Revo) GTX 460 1G RAM x 2 GeForce GT 335M (Alienware M11X R2)