nvidia performance problems (again)

Amarok Blog

Sunday, April 13. 2008

Posted by Seb Ruiz in sebr

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nvidia performance problems (again)

It’s that never ending story once again. Upgrade the video card, suffer extreme performance loss in the desktop:

swap nvidia 7900 card for 8600 (a meager upgrade, but still)

notice the desktop has dramatically slowed down (expected)

recompile the newest nvidia kernel drivers

reboot, and to no avail, no performance increase

repeat steps 3 and 4, each time tweaking something else. xorg.conf, ubuntu restricted drivers etc

DRI is enabled:

seb@hammerhead:~$ glxinfo | grep "direct" direct rendering: Yes

I know glxgears is no good benchmark, but at least it provides a slight indication to the performance of the card. 5000 fps is a rubbish result. Also, I’d expect to be able to run the desktop with compositing without an problems - which I can’t.

Can anybody provide a fool proof method of fixing this? I’m reaching out for the sake of my sanity!

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I have the same thing, except I'm caught between a rock and a hard place (I have same chipset you upgraded to); on Ubuntu 8.04 Beta the latest NVidia drivers introduce a serious regression where any Metacity decorations are seriously degraded. Upgrading to the beta driving from NVidia fixes that problem, but now X is using something like 35% of my CPU. Stuff like large pages in Firefox don't scroll smoothly, and games won't go to fullscreen automatically despite being set to do so.

You tell me what to do

#1 *daniel (Homepage) on 2008-04-13 22:35 (Reply)

One thing to do that I read was to un-check "sync to vblank" under "x server xvideo settings" in the NVIDIA x server settings.

#2 Carol on 2008-04-14 14:15 (Reply)

I hadn't seen that; I'm going to give it a shot... can't hurt, right?

#3 *daniel (Homepage) on 2008-04-14 14:36 (Reply)

Make sure you're actually using the nvidia drivers.

$ glxinfo | grep vendor
server glx vendor string: NVIDIA Corporation
client glx vendor string: NVIDIA Corporation
OpenGL vendor string: NVIDIA Corporation

#4 Anthony on 2008-04-18 12:05 (Reply)

export __GL_YIELD="NOTHING"

try this. cpu usage of my xserver has dropped dramatically and everything is working very well now

#5 justin on 2008-04-22 09:55 (Reply)

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