Re: [gentoo-amd64] nvidia performance problems with FSAA

["Kris Kersey (Augustus)" <augustus@linuxhardware.org>]

I haven't tried this myself, but I haven't heard of this problem either. 
I would try out the official NVIDIA Linux forums: 
http://www.nvnews.net/vbulletin/forumdisplay.php?s=&forumid=14
You'll find the most information there and possibly even hear from a 
developer.

Thanks,
Kris Kersey (Augustus)
LinuxHardware.org Site Manager
augustus@linuxhardware.org
AIM: Augustus22

On Fri, 30 Nov 2007, Hamish wrote:

>
> Hi all.
>
> I've got an amd64 install of gentoo, and I'm using the nvidia drivers package
> version x11-drivers/nvidia-drivers-100.14.19 compiled with gcc 4.2.0 and
> kernel 2.6.22-gentoo-r8. This is with a PNY 8600GT 256MB card (PCI-E 16x)
> (540MHz core, the overclocking doesn't seem to work as advertiosed with
> nvidia... The card just refuses to overclock... i.e. ignores any attempt).
>
> I have a small openGL program that takes 32 png's, loads them as textures and
> displays them on the screen, while performing FSAA at mode 7 (16x), set by
> using the __GL_FSAA_MODE=7 env variable.
>
> I have two screens... One 1280x1024 and one 1680x1050. Both at 60Hz, and i'm
> using TwinView.
>
> Starting my app at a window size of 1000x900 is fine. App runs with almost 0%
> CPU (AMD X2 4800+), and at 50FPS (The display is drawn ising glTimerFunc at
> 20ms intervals). All fine and dandy.
>
> But if I maximise the window to the full 1280x1024 resolution on the small
> monitor or 1680x1050 resolution on the big monitor, suddenly the application
> starts using 100% CPU. The CPU increase seems to happen when either the width
> or height goes above a certain value (Different for X & Y).
>
> Anyone else seen this? Disabling FSAA means I don't hit the problem, but then
> the display just doesn't look nice & smooth any more... Having fewer objects
> on the screen seems to make a difference too... There's no errors anywhere...
>
> I've tried installing the nvidia performance stuff (v2.1) but it doesn't
> compile OOTB. So that'll take some more investigation, but maybe someone else
> has been something? I wasn't aware that the nvidia drivers had a limit on
> either the resolution or number of textures that could be FSAA'ed in
> hardware.. Does it?
>
> TIA
>  Hamish.
>
>
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