I’ve never had your issue but the doc’s say:
qnx.com/developers/docs/6.5. … ocnto.html
which doesn’t quite seem to be your problem. So I am not sure about that note you found (I couldn’t find it on a google search) and it’s workaround suggestion and what that might help with your problem.
Disabling hyperthreading is normally a good idea on QNX when performance matters because QNX can’t tell that a hyperthread isn’t a real processor.
If you still have technical support (or even if you don’t) you may have better luck registering and posting on Foundry27 in the Kernel section where the QNX developers live and might be to provide more insight.
As a minimum here we’d need to know about how (commands your using) your binding processes/threads to CPU’s, how many of those processes threads you have. Are you going any adaptive scheduling etc? Anything else running etc?
Tim