[SDL] CPU-usage differences on winXP <-> Linux

[Jörgen Kornfeld]

Hi all,
strange things happen.. I have a 3 thread SDL / OGL application (main 
thread launches 1 thread for visualization & event handling, 1 for data 
reloading from hard disc). In the vis thread occurs heavy and cpu 
intensive data shifting, but not associated with SDL functions. Under 
Linux is everything fine and the program performance is acceptable, cpu 
usage @90-100%. On winXP the CPU usage lies between 0-5% and the 
performance is lousy.. Same code for both! Adjusting the nice values on 
winXp has no influence. Any ideas...? :-)