NAME | SYNOPSIS | DESCRIPTION | MODIFIERS | Opcode filtering | AUTHORS | COLOPHON

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

NAME         top

       libpfm_intel_ivbep_unc_cbo  -  support  for Intel Ivy Bridge-EP C-Box
       uncore PMU

SYNOPSIS         top

       #include <perfmon/pfmlib.h>

       PMU name: ivbep_unc_cbo[0-7]
       PMU desc: Intel Ivy Bridge-EP C-Box uncore PMU

DESCRIPTION         top

       The library supports the Intel Ivy Bridge C-Box (coherency engine)
       uncore PMU.  This PMU model only exists on Ivy Bridge model 62. There
       is one C-box PMU per physical core. Therefore there are up to fifteen
       identical C-Box PMU instances numbered from 0 to 14. On dual-socket
       systems, the number refers to the C-Box PMU on the socket where the
       program runs. For instance, if running on CPU15, then ivbep_unc_cbo0
       refers to the C-Box for physical core 0 on socket 1. Conversely, if
       running on CPU0, then the same ivbep_unc_cbo0 refers to the C-Box for
       physical core 0 but on socket 0.

       Each C-Box PMU implements 4 generic counters and two filter registers
       used only with certain events and umasks.

MODIFIERS         top

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

       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 threshold
              modifier (t) with a value greater or equal to one.  This is a
              boolean modifier.

       t      Set the threshold value. When set to a non-zero value, the
              counter counts the number of C-Box 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].

       nf     Node filter. Certain events, such as UNC_C_LLC_LOOKUP,
              UNC_C_LLC_VICTIMS, provide a NID umask.  Sometimes the NID is
              combined with other filtering capabilities, such as opcodes.
              The node filter is an 8-bit max bitmask. A node corresponds to
              a processor socket. The legal values therefore depend on the
              underlying hardware configuration. For dual-socket systems,
              the bitmask has two valid bits [0:1].

       cf     Core Filter. This is a 3-bit filter which is used to filter
              based on physical core origin of the C-Box request. Possible
              values are 0-7. If the filter is not specified, then no
              filtering takes place.

       tf     Thread Filter. This is a 1-bit filter which is used to filter
              C-Box requests based on logical processor (hyper-thread)
              identification. Possibles values are 0-1. If the filter is not
              specified, then no filtering takes place.

       nc     Non-Coherent. This is a 1-bit filter which is used to filter
              C-Box requests only for the TOR_INSERTS and TOR_OCCUPANCY
              umasks using the OPCODE matcher. If the filter is not
              specified, then no filtering takes place.

       isoc   Isochronous. This is a 1-bit filter which is used to filter C-
              Box requests only for the TOR_INSERTS and TOR_OCCUPANCY umasks
              using the OPCODE matcher. If the filter is not specified, then
              no filtering takes place.

Opcode filtering         top

       Certain events, such as UNC_C_TOR_INSERTS supports opcode matching on
       the C-BOX transaction type. To use this feature, first an opcode
       matching umask must be selected, e.g., MISS_OPCODE.  Second, the
       opcode to match on must be selected via a second umask among the
       OPC_* umasks.  For instance, UNC_C_TOR_INSERTS:OPCODE:OPC_RFO, counts
       the number of TOR insertions for RFO transactions.

       Opcode matching may be combined with node filtering with certain
       umasks. In general, the filtering support is encoded into the umask
       name, e.g., NID_OPCODE supports both node and opcode filtering. For
       instance, UNC_C_TOR_INSERTS:NID_OPCODE:OPC_RFO:nf=1.

AUTHORS         top

       Stephane Eranian <eranian@gmail.com>

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 perfmon2-devel@lists.sourceforge.net.  This
       page was obtained from the project's upstream Git repository 
       ⟨git://git.code.sf.net/p/perfmon2/libpfm4⟩ on 2017-04-25.  If you dis‐
       cover 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 man-pages@man7.org

                               February, 2014                      LIBPFM(3)