Re: [info-performer] frame-rate hell

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From: jan p. springer (jsd++at++igroup.org)
Date: 02/09/2006 14:53:13

Keith Parkins said the following on 02/09/06 22:37:
> Hello,
>
> I am currently migrating our Performer apps off of and sgi box to an Linux
> box (Athlon XP 3200, Quadro FX 2000, Fedora C3, Performer 3.1.1). I am
> running kernel 2.6.12-1.1381_FC3 with nvidia 7667 drivers and using
> twinview for our helmet. The fullscreen resolution is 640X480 (each eye).
> When I run my stats, the app + cul + draw all take less than a millisecond
> . . . but I'm getting 30Hz as the frame rate. I know this is right cause I
> ran some timers and it's ~30 ms at the begining of each frame.
>
> Does anyone have an idea why this is happening?
>
> Thanks,
> Keith
>

keith,

my guess is you want to set PF_SYNC_TO_VBLANK=0 at the command line. also it
might be a good idea to fetch a more recent nvidia driver (81.87 is current).
and i think you definitely want to run performer 3.2.1 (or up).
also, you could make your own modelines with a much higher refresh rate, e.g.

% gtf 640 480 120 -x

  # 640x480 ++at++ 120.00 Hz (GTF) hsync: 61.80 kHz; pclk: 52.41 MHz
  Modeline "640x480_120.00" 52.41 640 680 744 848 480 481 484 515 -HSync +Vsync

gtf should be installed on your fedora core 3 (from the xorg-x11 packages).

cheers,

        j. 

-- 
+------------------------------------+--------------------------------------+
| jan p. springer                    | jsd++at++igroup.org                       |
| computer science, buw.media.vrsys  | jan.springer++at++medien.uni-weimar.de    |
+------------------------------------+--------------------------------------+

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