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Old 01-27-09, 10:54 PM   #1
okreylos
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Default 180.22 OpenGL performance downgrade

Hi,

I just downloaded and installed the 180.22 Linux driver from Nvidia's site, and I noticed a significant 3D performance drop compared to the 177.82 driver I had installed before.

I appreciate that glxgears is not a benchmark, but since I didn't change anything else, I believe it is indicative of a change in the driver.

glxgears using 177.82: ~12000 fps
glxgears using 180.22: ~4700 fps

System: AMD Athlon 64 X2 2.4 GHz, Nvidia GeForce 7900GS on AGP 8x, Fedora 10, kernel 2.6.27.12-170.2.5.fc10.x86_64

Minimal xorg.conf with the following device section:

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "OnDemandVBlankInterrupts" "true"
Option "NoLogo" "true"
EndSection

Are there any settings I need to change? Could OnDemandVBlankInterrupts be the cause?

I'm not in a rush to upgrade the driver, but am very curious why there's such a marked drop in OpenGL performance.

Cheers!
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Old 01-27-09, 11:56 PM   #2
mooninite
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Default Re: 180.22 OpenGL performance downgrade

Read: http://wiki.cchtml.com/index.php/Glx...ot_a_Benchmark

Download and re-benchmark with Tropics demo: http://unigine.com/download/
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Old 01-28-09, 01:19 AM   #3
.:Ratmann:.
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Default Re: 180.22 OpenGL performance downgrade

Hell no! Please stop this stupid "glxgears is not benchmark blablabla" when such a huge difference (12000/4700=2.5!!!) takes place...
Quote:
Nvidia GeForce 7900GS on AGP 8x
Read this:
http://www.nvnews.net/vbulletin/showthread.php?t=118328
http://www.nvnews.net/vbulletin/show....php?p=1913846
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Old 01-28-09, 01:57 AM   #4
Fackamato
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Default Re: 180.22 OpenGL performance downgrade

Quote:
Originally Posted by .:Ratmann:. View Post
Hell no! Please stop this stupid "glxgears is not benchmark blablabla" when such a huge difference (12000/4700=2.5!!!) takes place...

Read this:
http://www.nvnews.net/vbulletin/showthread.php?t=118328
http://www.nvnews.net/vbulletin/show....php?p=1913846
But if there's a 2.5 difference in glxgears but no difference in a game?
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Old 01-28-09, 02:51 AM   #5
ledoc
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Default Re: 180.22 OpenGL performance downgrade

okreylos,
it could be instructive to run the real benchmark mooninite suggests and then compare those numbers with the glxgears fps.
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Old 01-28-09, 05:05 AM   #6
.:Ratmann:.
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Default Re: 180.22 OpenGL performance downgrade

Quote:
Originally Posted by Fackamato View Post
But if there's a 2.5 difference in glxgears but no difference in a game?
There is no need to run any benchmarks at all. Just do "grep GART /var/log/Xorg.0.log" and if you'll see
Code:
(II) NVIDIA(0): Initialized GPU GART
instead of
Code:
(II) NVIDIA(0): Initialized AGP GART
then you have a problem.
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Old 01-28-09, 05:07 AM   #7
Fackamato
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Default Re: 180.22 OpenGL performance downgrade

Quote:
Originally Posted by .:Ratmann:. View Post
There is no need to run any benchmarks at all. Just do "grep GART /var/log/Xorg.0.log" and if you'll see
Code:
(II) NVIDIA(0): Initialized GPU GART
instead of
Code:
(II) NVIDIA(0): Initialized AGP GART
then you have a problem.
What does this mean then?
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Old 01-28-09, 07:22 AM   #8
.:Ratmann:.
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Default Re: 180.22 OpenGL performance downgrade

It means that nVidia builtin AGP GART driver fails to initialize -> AGP disabled -> low 3d speed. But only developers can tell more.
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Old 01-28-09, 09:30 AM   #9
pseudonymous
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Default Re: 180.22 OpenGL performance downgrade

Quote:
Originally Posted by okreylos View Post
I appreciate that glxgears is not a benchmark, but since I didn't change anything else, I believe it is indicative of a change in the driver.

glxgears using 177.82: ~12000 fps
glxgears using 180.22: ~4700 fps

System: AMD Athlon 64 X2 2.4 GHz, Nvidia GeForce 7900GS on AGP 8x, Fedora 10, kernel 2.6.27.12-170.2.5.fc10.x86_64
I have a similar system with a GeForce 6800 that saw a similar decrease in performance, on a whim I tried the
Code:
$ nvidia-settings -a InitialPixmapPlacement=2
workaround suggested here http://www.nvnews.net/vbulletin/show...48&postcount=1
performance went back to normal.
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Old 01-28-09, 11:42 PM   #10
okreylos
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Default Re: 180.22 OpenGL performance downgrade

OK, it looks like I have the same problem as described in thread

http://www.nvnews.net/vbulletin/show....php?p=1913846

In short, the Nvidia driver doesn't detect / initialize AGP the first time X starts after a reboot. While I was re-doing my measurements with some "real benchmarks," I went back and forth between 177.82 and 180.22 several times, and on the second time performance was up to 177.82 levels -- with one interesting exception: in my Doom3 renderer, I get 119.2 fps under 177.82 and 112.1 fps under 180.22 with the exact same view setup. But that's minor, and probably explained by the new driver allocating more GPU memory for its X pixmap cache. My viewer itself allocates at least 196 MB of texture memory (my card has 256), so it's probably swapping -- no surprise there.

Thanks for everybody's suggestions. I'll revert back to 177.82 until there's a fix. This is my home computer, and I usually power it up and only log in once, so I would see the problem every time.
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