Hi very frequently (every 10 secs) i''m getting the following lines in mpstat: CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt 13 0 0 0 8 0 0 7 0 0 0 22731 8 92 0 high sys times with an increment in system calls. I''d like to observe more deeply this situation to see where this syscalls come from using dtrace, i thought about speculative tracing, please can someone point me to some example or hint? rgds roberto,