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Performance differences

Started by Cone83 Jan 26, 2003 at 8:31 AM 6 replies 450+ views

Original Post

Jan 26, 2003 at 8:31 AM

I''m currently writing on a cross plattform 3d game. I use GLUT, and 95% of the source is plattformindependet code. On Linux I meassured about 60 frames per second. When I render the same scene on windows I just get about 25 frames per second. How is this possible? I ran it on the same computer (multiboot system). I can''t belive that the reason is the performance differences of the drivers (I have a NVidia graphics card an I use their drivers on Windows an Linux). And I alway thought windows would be better for games... ;-) Cone

zedzeek

164

zedzeek

Jan 26, 2003 at 12:20 PM

are u using the same screensize + colordepth with both versions?
is cpu use on both systems the same?

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

Cone83

Author

Cone83

Jan 26, 2003 at 4:10 PM

> are u using the same screensize + colordepth with both versions?

Yes, all equal

> is cpu use on both systems the same?

It is even the same system which has both operating systems installed (by using a boot manager)

Raduprv

202

Raduprv

Jan 26, 2003 at 4:35 PM

Post some screenshots, and/or soem code.

Height Map Editor | Eternal lands

Taharez

Jan 26, 2003 at 4:38 PM

Cone83, cpu usage in zedzeek''s post refers to how much of the cpu is used when running the program. So to put it another way, do you run a bunch of other programs while testing it in windows?

Cone83

Author

Cone83

Jan 26, 2003 at 4:58 PM

On both system it grabs 100% of the CPU ;-)
I tried it on windows when no program was running and I could speed it up to 40 Frames, but that is still much slower than with linux.

Screenshots and Source are availible at balour.sf.net
I recently made engine redesign (not yet totally completed) which is just in the CVS but I had the problem before.

zedzeek

164

zedzeek

Jan 26, 2003 at 11:36 PM

perhaps youre running off the hardware path with the windows driver which isnt happening under linux, grab the latest drivers for windows + linux.
also perhaps u have FSAA enabled in windows

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

Null and Void

163

Null and Void

Jan 26, 2003 at 11:46 PM

quote:
Original post by Cone83
And I alway thought windows would be better for games... ;-)

Off topic: with good drivers, that is not the case. With the next kernel release (2.5.x, to become 2.6.x) the gap will only widen (2.5.x is a huge improvement over 2.4.x).

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