View Full Version : Texture download performance
(this question is also asked in the linux group)
Has anybody checked downloading times for textures?
I would like to know various results, specifically 1024x768,
720x576, 640x480 using glSubTexImage2D.
Preferably also the same hardware with DirectX.
Under Linux with GeForce2 and PIII 700MHz I have at most
23-34 ms for 720x480 texture RGB 24-bit.
02-06-2001, 11:39 AM
Here are some stats from my engine's log :
DataManager Previews : Sent a 720x576x32 sub image in 39.01 ms (40.559028 MB/s)
DataManager Previews : Sent a 360x288x32 sub image in 8.90 ms (44.457537 MB/s)
DataManager Previews : Sent a 1024x768x32 sub image in 65.67 ms (45.679646 MB/s)
Tests done on a RadeON DDR in Win2K, on an old Dual PII-300 which can only do AGP x2.
Sorry i can only test with 32bpp textures.
Hope this helps !
[This message has been edited by paddy (edited 02-06-2001).]
thnx a lot, exactly the kind of stuff I want to know. It was OpenGL or DirectX?
Lousy performance though... But it matches what I've found.
I find our SGI Onyx2 with InfiniteReality about 5-10 times faster :-)
And I thought that was slow...
I don't think pixel size matter that much.
[This message has been edited by plg (edited 02-06-2001).]
02-06-2001, 11:55 AM
Yeah, lousy http://www.opengl.org/discussion_boards/ubb/smile.gif
We are far from the official Intel AGP specifications !
02-06-2001, 12:17 PM
Well, seeing as there are a million other reasons why pure TexSubImage performance may not match (or even have anything to do with) AGP performance, it's pretty meaningless to compare those numbers with your AGP bandwidth.
02-06-2001, 12:28 PM
Hey, Matt !
Give us some tips to improve this !
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