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Old 07-19-04, 09:40 AM   #1
glvertex
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Default 6106 driver UNDERclocks GeForce 6800 ??

I just got a GeForce 6800 (NV40), installed the 6106 driver, and started testing.
I noticed immediately something is wrong with the performance.
So I checked with the nvclock utility what is going on.
Right after the X server starts up, the clocks are programmed to what they
should be. GPU = 400 , mem = 1100
But immediately after an OpenGL program starts up, the clocks drop to
GPU = 300 , mem = 600 !!
My synthetic fillrate benchmark program shows this clearly.
The (single , tiny texture) fillrate is below 1000Mpix/sec , while it was
1100Mpix/sec already on the GeForce4 Ti4600, and is around 1800Mpix/sec
on the 5900-U.

Anyone?
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Old 07-19-04, 10:21 AM   #2
zander
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

I doubt that nvclock can be relied upon to report correct nv40 clocks. Are you using a standard 6800 or the Ultra variant?
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Old 07-19-04, 11:27 AM   #3
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

If nvclock from cvs is being used it should correctly display the clocks. It contains the same nv40 code as the opensource nv driver.
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Old 07-20-04, 03:22 AM   #4
glvertex
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

I am using the ultra vriant.
I am using the nvclock from cvs (yesterday's). It correctly reports clocks.
I can tell this by how it reports the clocks _before_ an OpenGL app is started.
It reports GPU=400 and mem=1100
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Old 09-06-04, 04:12 PM   #5
kmike
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

Interesting, sounds very much like downclocking due to overheating. I remember it is being used in windows drivers.. might be the case with linux drivers, too.
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Old 09-07-04, 02:03 AM   #6
zander
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

I believe in this particular case, the problem turned out to be a bad VBIOS.
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Old 09-07-04, 05:04 AM   #7
kmike
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Default Re: 6106 driver UNDERclocks GeForce 6800 ??

While we're on subject of downclocking - windows drivers have the feature of different clock speeds for 2D and 3D mode. Will this be available in Linux drivers?
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