> Well, there are some time-tick events. E.g. Intel Core 2 has the > CPU_CLK_UNHLATED:REF event, that is described by Intel in the following > way: > > But when I try to use interval sampling in pfmon, with sample period set to > 100 ms, > the counts of this event oscillate, sometimes with differences even 100x - > 1000x.
I'm not sure if it's causing this particular problem for you, but check the intel errata. There's one for this perf counter that makes the count vary with system frequency on some machines. A core2 machine we have exhibits this erratum. I don't think that would cause a 100x difference though. See the document here: http://www.intel.com/design/mobile/specupdt/314079.htm especially #ah99 though there are many other perf counter issues in that document. Vince ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ perfmon2-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
