I use the CPU as timer and I have a dual Xeon box. So I use the SMP but I have phisically 2 CPUs. I don't use HyperThreading.
The TSCs on an SMP box may drift apart. Can you reproduce the problem with gettimeofday as time source?
Regards Patrick _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc