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)