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Old 05-02-06, 11:24 PM   #1
am2020
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Default Suggestiong for fixing slowness on x86_64 TwinView ?

x86_64 HP xw9300 (Dual-Dual Core AMD 280), dual QuadroFX4500 (SLI connected), NVIDIA 8756 (no SLI option in xorg.conf)

glxgears performance:

TwinView ( 2 DFP displays) : 4000 fps (both displays)
no twinView: 26000 fps !!! ( 6 times faster!)


On an HPxw800, Dual Xeon, 6800GT, NVIDIA 8756 I get TwinView glxgears of 12000 fps
on both displays... faster than the dual FX4500s !!!

Any suggestions?
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Old 05-02-06, 11:43 PM   #2
netllama
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

glxgears is not a benchmark, as its performance is heavily influenced by many outside factors. Are you experiencing performance problems with any real-world applications?

-Lonni
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Old 05-03-06, 12:26 PM   #3
am2020
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Yes, as a matter of fact. the glxgears tests were done after noticing a slowness iin my
particular engineering application when i went to TwinView.
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Old 05-03-06, 12:51 PM   #4
netllama
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Which engineering application is this, and how can I reproduce the problem?

Additionally, please generate and post an nvidia-bug-report.log.

Thanks,
Lonni
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Old 05-04-06, 05:54 AM   #5
prefect42
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

We'd previously noted major performance problems with twinview on a Quadro 4400 and 3000 running both under windows and linux about a year ago. Under windows in TwinView Performance mode you'd get around 5% of the performance running the nvidia Dawn demo than in single head mode (3fps vs synced limit of 60fps). Under linux we were seeing similar problems although I've not looked into it again properly. I probably should as I've just started using TwinView extensively.
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Old 05-04-06, 03:53 PM   #6
am2020
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Lonni,
Please see attached bug report.

Engineering application is custom and propietary. I don't see the slowness in another
TwinView environment with 6800GT card, i.e. the FPS remain roughly the same between
single screen and TwinView. I have reproduced it in both 8178 and 8756, I haven't got
further back in version numbers.
Attached Files
File Type: zip nvidia-bug-report.log.zip (24.5 KB, 140 views)
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Old 05-04-06, 04:59 PM   #7
netllama
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

I have a few questions based on your bug report:
0) Is there a reason why you're using the noapic and nolapic kernel parameters?
1) Does performance improve with a recent kernel.org kernel (instead of Mandriva's kernel)?
2) Why are you using the ConnectedMonitor and NoPowerConnectorCheck options in your xorg.conf?
3) Does performance improve with a more recent SBIOS (such as 2.05)?

Thanks,
Lonni
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Old 05-04-06, 07:38 PM   #8
am2020
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Modified my system as per your questions (except new kernel from kernel.org).
New bug-report is attached.
No changes in performance.
Attached Files
File Type: zip nvidia-bug-report.log.zip (24.1 KB, 134 views)
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Old 05-04-06, 09:08 PM   #9
netllama
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

You still seem to have acpi disabled. However, I suspect that the kernel you're using is playing a role in the performance problems.

If using a more recent kernel doesn't help, I'm going to need a means of reproducing the performance problem.

Thanks,
Lonni
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Old 05-05-06, 02:37 PM   #10
am2020
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Lonni:
I ran kernel 2.6.16 with same results. But I have new information now.
So here it is, and yes I know about glxgears....

Twinview glxgears fps: ~ 4000

Now, load nvidia-settings control panel, go to OpenGL Settingsm and under Performance
uncheck Allow Flipping.

Now, without any other change, Twinview glxgears is up to 16000 fps !!!

(Do you need my new bug report?)
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Old 05-05-06, 02:48 PM   #11
netllama
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

Is your "custom and propietary" engineering application performing to your expectations now as well?

-Lonni
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Old 05-05-06, 03:47 PM   #12
am2020
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Default Re: Suggestiong for fixing slowness on x86_64 TwinView ?

I will test again later today, after the next next build of the app is ready.

By the way, I tested in single screen (no Twinview), and the effect of cheking the
"Allow flipping" is opposite: it *increases* the fps, as i thought it was intended... right?
Why am I seeing the opposite effect in Twinview?

And a question: if glxgears is not a benchmark, which one do you recommend ?
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