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michael.bauer
02-07-2005, 09:49 AM
Hi,

I would like to get some numbers / results for the nvidia pbo test tool on different hardware.
(AGP, PEG, with different GPUs, different mainboards+chipsets)

Which results do you get?

What do the results tell us?

gdewan
02-07-2005, 11:22 AM
Where is this tool? I just went looking on nZone and both the registered and public nvidia developer sites and found no such thing.

Matt Zamborsky
02-07-2005, 12:43 PM
I think that it's somwhere between the demos on NVIDIA developer site.

def
02-08-2005, 06:00 AM
GeForce 6800GT Ultra AGP (67.11)
Dual Xeon 7505 chipset

I get strange line artifacts when running the image sink.
My Readpixel readback seems faster than the PBO readback. This shouldn't happen, right?

PBO
Normal (glReadPixels)
FP16 RGBA
GL_FLOAT_RGBA16_NV
Gamma Shader
57.20
387.9
193.7
581.6

Does anybody know how to change the exposure setting? And what do we need this pseudo timecode in the lower right window corner for?

michael.bauer
02-08-2005, 06:09 AM
Originally posted by gdewan:
Where is this tool? I just went looking on nZone and both the registered and public nvidia developer sites and found no such thing.I've found it in the 8.5 SDK browser under "samples"
and it's named "PBO Texture Performance".
(btw., shouldn't it be located under "tools"?)

michael.bauer
02-08-2005, 06:19 AM
test hw:

P4 3.06GHz, Intel 865PE chipset, Geforce 6800Ultra (AGP), 71.80 driver

test setup:

upload PBO
readback PBO (asynchronous)
image format FP16
internal format: FP16
shader: gamma hdr
dummy workload disabled

results:
FPS / download / readback / total transfer
60 / 406.9 / 201.4 / 604.3

same with dummy workload

30 / 203.4 / 101.7 / 305.2

michael.bauer
02-13-2005, 10:35 AM
> My Readpixel readback seems faster than the PBO readback. This shouldn't happen, right?

That's my experience, too.

> Does anybody know how to change the exposure setting?

There's a shader setting in the context menu. I think, it's called "gamma".

> And what do we need this pseudo timecode in the lower right window corner for?

Just for fun, i think.

But what do the results of this tool tell us?

Hint to NVIDIA: Why don't you write the results of the tool into a log file so that we could better compare the results.