Tomas, On Wed, May 30, 2007 at 03:08:28PM +0200, Tomas Kalibera wrote: > > I have a question why pfmon does not measure the TSC counts on the IA32 > platform, using the RDTSC instruction ? I've seen that earlier versions > of perfmon had a function that did this (get_timestamp). The nice thing > I like on TSC is that it keeps counting while the processor/processors > are halted or even powered down, so that it gives more precise > estimation of the wall clock time than the other tick counters (i.e. > GLOBAL_POWER_EVENTS:RUNNING). > TSC is not a performance counter. It does not behave the same way. Earlier versions of perfmon were using TSC to timestamp samples, It was never used as a counter you can just read.
-- -Stephane _______________________________________________ perfmon mailing list [email protected] http://www.hpl.hp.com/hosted/linux/mail-archives/perfmon/
