Re: Perfomance problems with NVidia

[Sven Krahn <sven.krahn@gmail.com>]

On 7/7/05, Jamie Jones <hentai_yagi@yahoo.com.au> wrote:
> Out of curiosity what are your values for
> /proc/driver/nvidia/version
> /proc/driver/nvidia/agp/card
> /proc/driver/nvidia/agp/host-bridge
> /proc/driver/nvidia/agp/status

> That may provide a clue as to why your performance seems a little slow

Good idea, here are mine:

> eg On my (Ubuntu) system I get

Debian amd64 sid - 2.6.11-9-amd64-k8

> jamie@workhorse:~$ cat /proc/driver/nvidia/version
> NVRM version: NVIDIA Linux x86_64 NVIDIA Kernel Module  1.0-7174  Tue
> Mar 22 06:45:40 PST 2005
> GCC version:  gcc version 3.3.5 (Debian 1:3.3.5-8ubuntu2)

NVRM version: NVIDIA Linux x86_64 NVIDIA Kernel Module  1.0-7174  Tue
Mar 22 06:45:40 PST 2005
GCC version:  gcc version 3.4.5 20050613 (prerelease) (Debian 3.4.4-4)

Would gcc-3.4 cause a performance difference of the driver versus 3.3?

> jamie@workhorse:~$ cat /proc/driver/nvidia/agp/card
> Fast Writes:     Supported
> SBA:             Not Supported
> AGP Rates:       4x 2x 1x
> Registers:       0x1f000017:0x1f000114

Fast Writes:     Supported
SBA:             Supported
AGP Rates:       8x 4x
Registers:       0x1f000e1b:0x1f004302

Fast writes seem to be supported, however, I don't manage to activate
them. I have
   Option          "AGPFastWrite"          "true"
in my xorg.conf, and alternatively I did also try to load the nvidia
driver with the experimental option NVreg_EnableAGPFW=1 before
starting X. But Fast Writes always shows up as Disabled in
/proc/.../status (see below).

> jamie@workhorse:~$ cat /proc/driver/nvidia/agp/host-bridge
> Host Bridge:     VIA Technologies, Inc. VT8385 [K8T800 AGP] Host Bridge
> Fast Writes:     Supported
> SBA:             Supported
> AGP Rates:       4x 2x 1x
> Registers:       0x1f000a17:0x00000114

Host Bridge:     Silicon Integrated Systems [SiS] 755 Host
Fast Writes:     Not Supported
SBA:             Supported
AGP Rates:       8x 4x
Registers:       0x1f004e0b:0x00000f02

> jamie@workhorse:~$ cat /proc/driver/nvidia/agp/status
> Status:          Enabled
> Driver:          AGPGART
> AGP Rate:        4x
> Fast Writes:     Enabled
> SBA:             Disabled

Status:          Enabled
Driver:          AGPGART
AGP Rate:        8x
Fast Writes:     Disabled
SBA:             Enabled

Fast Writes is disabled, how to activate it? Maybe the "LE" of my
5700LE restricts the Fast Writes, not sure, need to check...

Thanks again.
-- 
Best regards / Mit den besten Grüssen
Sven Krahn