Re: [Flightgear-users] engine or hard drive sputter ???

[Curtis L. Olson]

Mike Rawlins wrote:
--- Jon Elson <[EMAIL PROTECTED]> wrote:
 

Mike Rawlins wrote:
   

I'm running v0.9.8 compiled from CVS checkout.  OS
     

is
   

Fedora Core 2.  At almost exactly 20 second
     

intervals,
   

I hear what sounds like an engine "sputter", or
     

better
   

yet, a crackle.  I used to think it was a problem
     

with
   

hard drive or memory access, until I realized last
night that it occures every 20 seconds (+/- less
     

than
   

1 second). Also, the Cessna 172 pitches up when I
     

have
   

back pressure on the joystick, or downward if there
     

is
   

forward pressure.  Plane is virtually impossible to
control when on final at 1500-1700 RPM and 65
     

knots. 
   

Stall horn beeps as well.
I get the crackle sound on other aircraft (737,
     

Piper
   

Cherokee Warrior II), without the pitching
     

up/down).
   

A particularly annoying problem since the C172 is
affected most.
Any ideas? I thought maybe the C172 needs fuel
     

mixture
   

adjustments???  The regularity of this is uncanny!
     

I *think* this is the Astro component of FlightGear
updating the
positions of objects in the sky.  The time
discontinuity is probably
responsible for the pitch changes.  (Although it
shouldn't have
that effect.)  What speed CPU do you have?
Jon
   

CPU is Pentium 4, 1.6 GHz on my Dell Inspiron 8200.
Laptop is about 2 years old. 2 GB RAM.
One of our tech guys at work said CPU speed is likely
irrelevent to the graphics performance, and instead
suggests that my 32MB NVIDIA GeForce2 video card
(default setup out of the box) can't keep up.  But why
the regular 20-second intervals to this particular
anomaly?  Can anyone else weigh in on this particular
video card?  Are there options to set to test whether
or not I'm pushing to hard on the graphics (disable
random objects, etc)?
 

I would be tempted to look at what else might be running on your 
machine?  Do you have a web browser open?  An email client?  Once in a 
while I've scratched my head over poor/odd flightgear performance, only 
to discover I had a web page open with piles of useless animated adds 
... such as weather underground or RC universe...  Do you have some 
applet on your desktop that is going out and fetching weather or stock 
quotes every 20 seconds?  Some distributions/OS's can load up your 
desktop with all sorts of awful crap.

Regards,
Curt.
--
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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