NAME

       libpfm_intel_snb_unc - support for Intel Sandy Bridge uncore PMU

SYNOPSIS

       #include <perfmon/pfmlib.h>

       PMU name: snb_unc_cbo0, snb_unc_cbo1, snb_unc_cbo2, snb_unc_cbo3
       PMU desc: Intel Sandy Bridge C-box uncore

DESCRIPTION

       The  library supports the Intel Sandy Bridge client part (model 42) uncore PMU.  The support is currently
       limited to the Coherency Box, so called C-Box for up to 4 physical cores.

       Each physical core has an associated C-Box which it uses to communicate with the L3  cache.  The  C-boxes
       all  support  the  same set of events. However, Core 0 C-box (snb_unc_cbo0) supports an additional uncore
       clock ticks event: UNC_CLOCKTICKS.

MODIFIERS

       The following modifiers are supported on Intel Sandy Bridge C-Box uncore PMU:

       i      Invert the meaning of the event. The counter will now count cycles  in  which  the  event  is  not
              occurring. This is a boolean modifier

       e      Enable edge detection, i.e., count only when there is a state transition from no occurrence of the
              event to at least one occurrence. This modifier must be combined with a counter mask modifier  (m)
              with a value greater or equal to one.  This is a boolean modifier.

       c      Set  the  counter  mask  value. The mask acts as a threshold. The counter will count the number of
              cycles in which the number of occurrences of the event is greater or equal to the threshold.  This
              is an integer modifier with values in the range [0:255].

       Both   the  UNC_CBO_CACHE_LOOKUP  and  UNC_CBO_XSNP_RESPONSE  requires  two  umasks  to  be  valid.   For
       UNC_CBO_CACHE_LOOKUP the first umask must be one of the MESI state umasks, the second has to  be  one  of
       the filters.  For UNC_CBO_XSNP_RESPONSE the first umask must be one of the snoop types, the second has to
       be one of the filters.

AUTHORS

       Stephane Eranian <eranian@gmail.com>

                                                  August, 2012                                         LIBPFM(3)