Jerky Movement

Yacoby · Post by **Yacoby** » Thu Sep 06, 2007 12:04 am

I took a look at the examples (1.3.1), and have experienced some problems:
Mainly the examples that involve movement and/or animation are very jerky, not that the program is jerky, just the animation/movement. It seems to jerk back to the place it was half a second a go for a couple of milliseconds

The programs FPS seems to sit at 1, sometimes jumping up to 100+ for a couple of milliseconds.

My computer should be able to run the programs:
GeForce 6150LE (64Mb, integrated)
~1Gb RAM
Athlon 64 4200+

WinXP Pro 32bit

Does anyone have any suggestions? I would love to get it fixed.

EDIT:
I forgot to say, it is the same with v 1.2, but the FPS is displayed as 0 most of the time, despite moving at alot faster than they would at 0fps

Virion · Post by **Virion** » Thu Sep 06, 2007 7:44 am

show us your code.

hybrid · Post by **hybrid** » Thu Sep 06, 2007 9:07 am

Is it an AMD X2 or a single core? There are timing problems under Windows with dual cores.
Do you have the latest video drivers installed? any other applications running in parallel? which drivers do you use (i.e. did you test OpenGL and D3D, or just software driver)?

Yacoby · Post by **Yacoby** » Thu Sep 06, 2007 10:52 am

OK, I brought my computer out of standby, and the problem seems to have resolved itself, it looks like it was a fault at windows end rather than Irrlichts end.

Virion · Post by **Virion** » Thu Sep 06, 2007 1:48 pm

hybrid wrote:Is it an AMD X2 or a single core? There are timing problems under Windows with dual cores.
Do you have the latest video drivers installed? any other applications running in parallel? which drivers do you use (i.e. did you test OpenGL and D3D, or just software driver)?

there's difference between them?

hybrid · Post by **hybrid** » Thu Sep 06, 2007 2:45 pm

Which one? The dual and single core? Yes, one has a core more

Problem is that Windows process scheduler has some problems with task switching and core switching.

genesisrage · Post by **genesisrage** » Sun Oct 21, 2007 8:06 am

was having a similar problem (if not the same one)

GeForce 8800 GTS (640mb)
2GB Ram
Athlon FX-62 (2.8Ghz)

XP Pro 32-bit

and reading HYBRID's comment about timing problems, did some research and found out AMD does have a fix for it. (AMD Dual Core Optimizer)
http://www.amd.com/us-en/Processors/Tec ... 06,00.html

hopefully this helps out some people. i know it sure helped me

Midnight · Post by **Midnight** » Sun Oct 21, 2007 8:18 am

so where does that leave the core 2 duo machines? lol

is the problem only with AMD or with irrlicht and windows?

how can one prevent this from causing problems?

hybrid · Post by **hybrid** » Sun Oct 21, 2007 1:16 pm

The problem was only with AMD processors because they updated the internal timer devices in the processors to make them more useful for parallel processing apps. However, Windows scheduling did not work with that.