5 Replies Latest reply on Dec 12, 2012 1:55 AM by avk

    performance counters


      Hi guys,


      I am trying to access the performance counters of a AMD CPU of family 14h.


      As I understand there are two registers of interest as documented in the bios and kernel developer reference of the  14h family (attached):


      - PERF_CTL[3:0]  performance event select

      - PERF_CTR[3:0] performance event counter


      I set PERF_CTL[0] which is at MSR0xC0010000   to  value "0x400076" this should enable the counter and select event 76h


      reading the value at PERF_CTR[0]  at MSR0xC0010004   it always return value ''0".


      Are there any further registers I have to be aware of?


      Please respond guys - I really appreciate your help.