Hi all, I wanted to understand how perfmon uses hardware performance counters. x86 has PERF_EVT_SEL-IA32_PMC programmable counters and the fixed IA32_FIXED_CTRs. I was assuming that perfmon uses only the programmable counters for counting events. The reason I have this question is that I have an application that reads the IA32_FIXED_CNTR MSRs to calculate the current processor frequency. (It is a Nehalem machine.) My app accesses the MSRs using /dev/cpu/*/msr.
The moment I start pfmon, my application stalls. I suspect it is because pfmon overwrites the FIXED_CNTR MSRs when it starts. Is there a way we can force perfmon to use only the PERF_EVT_SEL MSRs? - Ananth ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
