LIBPFM(3)						     Linux Programmer's Manual							 LIBPFM(3)

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 communictate 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  occur-
	      rences 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)