bugzilla-daemon at defect.opensolaris.org wrote: > http://defect.opensolaris.org/bz/show_bug.cgi?id=5546 > > > Eric Saxe <eric.saxe at sun.com> changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > CC| |eric.saxe at sun.com > > > > > --- Comment #3 from Eric Saxe <eric.saxe at sun.com> 2008-12-02 18:12:54 --- > Incidentally... > > I looked into the cause of all the xcalls showing up in PowerTOP (when run on > an idle system), and the vast majority of them were due to DTrace itself... > > *very* few of them were as a result of P-state changes.... >
DTrace uses xcalls to sync the per CPU buffers, so high aggregation rates on multiprocessors generate lots of xcalls. Increasing PowerTOP's interval (or using the default ;)) minimizes this effect. Rafael
