OpenGL is too slow on Ubuntu 10.04LTS

[cervo]

Hello,

I have a trouble.

I have developed 3D CG software on Ubuntu and FreeBSD.
I use OpenGL and GLSL on recent nvidia driver(256.44, 256.53, 260.19.04).

Ubuntu is too slow in comparison with FreeBSD(or other linux distribtuion).

For example, FreeBSD is 25 times faster than Ubuntu on GeForce GTX 480.
Moreover, when I have checked on another distribution(CentOS 5.4), the rendering speed is as fast as FreeBSD.

I think that it is restricted in something on Ubuntu.

Does anyone know the reason?


I have checked following setting.

I have confirmed "nvidia driver is enabled" on nvidia-setting and /var/log/Xorg.0.log.
There is no errors in /var/log/Xorg.0.log.

Other setting information.
1. purge and disable exist nvidia-driver
2. disable xinerama
3. disable nouveau
4. enable or disable Sync to VBlank
5. disable 3D desktop(compiz) setting

Our system
OS: Windows 7 Pro(64bit), FreeBSD 8.1-stable(64bit), Ubuntu 10.04.1LTS(64bit) triple boot

*PC1
CPU; Intel Core2Quad Q9550S
MEM: 8GB

*PC2
CPU: Intel Core i7 920 (2.66GHz)
MEM: 9GB

GPU: We checked following all GPU.
nvidia GeForce 9600GT
nvidia GeForce 9800GT(Green Edition)
nvidia GeForce GTX 275
nvidia GeForce GTX 295
nvidia GeForce GTX 460
nvidia GeForce GTX 480

[Licaon]

Originally Posted by cervo

I have developed 3D CG software on Ubuntu and FreeBSD.
I use OpenGL and GLSL on recent nvidia driver(256.44, 256.53, 260.19.04).

Tried Debian Sid too?
Any sample program?
can you read http://www.nvnews.net/vbulletin/showthread.php?t=46678 and generate a good report with the debug info as instructed after the issue appears ?

[mickski56]

Just a wild guess as I don't run ubuntu. But are you running a compositing window manager. Compositing really hurts opengl performance.

[Licaon]

Originally Posted by mickski56

Just a wild guess as I don't run ubuntu. But are you running a compositing window manager. Compositing really hurts opengl performance.

He mentioned that in his post: 5. disable 3D desktop(compiz) setting

[adamk75]

How are you determining the speed?

Adam

[cervo]

Licaon, mickski56, adamk75,
thank you for your reply.

I have attached nvidia-bug-report.log.gz in this article.

I tried checked many many program code of OpenGL and GLSL such as our software or GLSL sample code from internet.
(i.e. http://marina.sys.wakayama-u.ac.jp/~...lection.tar.gz)

As far as I am concerned, any program code of OpenGL with GLSL slow down on Ubuntu.

I have never checked OpenGL rendering speed on Debian.
But I have checked FreeBSD and Windows 7 performance on the same PC(multi boot).
The rendering performance of FreeBSD and Windows 7 is very good.
The rendering is very smooth visually.


I have checked rendering speed on other window manager( xfce and WindowMaker) on Ubuntu.
However, the rendering speed is still slow.

I have determined rendering speed by calculating FPS at display() function of glut.
Moreover I can see "frame drop of rendering image" visually on Ubuntu.
The rendering is not smooth visually.

[Licaon]

Originally Posted by cervo

I have never checked OpenGL rendering speed on Debian.

Do try it too, something like aptosid, as maybe Ubuntu messes some things up.

[cervo]

I'm sorry for this delay.

I have checked Debian unstable version(aptosid).
The rendering speed of Debian is slow, too.

And also, I have checked Fedora 14 and Ubuntu 10.10(clean installed).
These rendering speed are slow, too.
The rendering speed is as slow as Ubuntu 10.04LTS.

Maybe...
Is rendering speed of recent linux distribution always slow?

[gradinaruvasile]

What driver version do you use?
And what xorg versons did you test?

Tried to compile the code from reflection.tar.gz and i got this:

$ make
g++    -c -o main.o main.cpp
g++    -c -o glsl.o glsl.cpp
g++    -c -o Box.o Box.cpp
g++    -c -o Obj.o Obj.cpp
Obj.cpp: In member function ‘void Obj::copy(const Obj&)’:
Obj.cpp:87: error: ‘memcpy’ was not declared in this scope
Obj.cpp:97: error: ‘memcpy’ was not declared in this scope
make: *** [Obj.o] Error 1

What should i install to make it work?

[gradinaruvasile]

This is from the nvidia error log you attached:

(EE) Jul 31 02:01:22 NVIDIA(0): Failed to initialize the NVIDIA kernel module. Please see the
(EE) Jul 31 02:01:22 NVIDIA(0):     system's kernel log for additional error messages and
(EE) Jul 31 02:01:22 NVIDIA(0):     consult the NVIDIA README for details.
(EE) NVIDIA(0):  *** Aborting ***
(II) UnloadModule: "nvidia"
(II) UnloadModule: "wfb"
(II) UnloadModule: "fb"
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

Normally this means that you have no functioning x server.

Just out of curiosity, what glxgears score do you have?

[cervo]

Originally Posted by gradinaruvasile

This is from the nvidia error log you attached:

(EE) Jul 31 02:01:22 NVIDIA(0): Failed to initialize the NVIDIA kernel module. Please see the
(EE) Jul 31 02:01:22 NVIDIA(0):     system's kernel log for additional error messages and
(EE) Jul 31 02:01:22 NVIDIA(0):     consult the NVIDIA README for details.
(EE) NVIDIA(0):  *** Aborting ***
(II) UnloadModule: "nvidia"
(II) UnloadModule: "wfb"
(II) UnloadModule: "fb"
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

Normally this means that you have no functioning x server.

Just out of curiosity, what glxgears score do you have?

gradinaruvasile
Thank you for your reply.

I have attached Xorg.0.log on Fedora 14 on this article.
X server works normal.y.
There is no error in the log.

glxgear score is 87352 on GTX 460.

Maybe, I made mistake in operation of nvidia-bug-report.sh.

However our software is still slow on Fedora or Ubuntu.

[ShiningArcanine]

Try running it on Sabayon Linux. I believe that the Nvidia drivers for Linux and FreeBSD have a great deal in common, so if it is also slow on Sabayon Linux, then then I think this could be some sort of kernel regression.