libpfm_intel_snb_unc(3) — Linux manual page

NAME \| SYNOPSIS \| DESCRIPTION \| MODIFIERS \| AUTHORS \| COLOPHON

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

NAME top

       libpfm_intel_snb_unc - support for Intel Sandy Bridge uncore PMU

SYNOPSIS top

       #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 top

       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 top

       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 top

       Stephane Eranian <[email protected]>

COLOPHON top

       This page is part of the perfmon2 (a performance monitoring
       library) project.  Information about the project can be found at
       ⟨http://perfmon2.sourceforge.net/⟩.  If you have a bug report for
       this manual page, send it to
       [email protected].  This page was obtained
       from the project's upstream Git repository
       ⟨git://git.code.sf.net/p/perfmon2/libpfm4 perfmon2-libpfm4⟩ on
       2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-04-24.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to [email protected]

                              August, 2012                     LIBPFM(3)