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NAME | SYNOPSIS | DESCRIPTION | MODIFIERS | AUTHORS | COLOPHON |
LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
libpfm_intel_snbep_unc_qpi - support for Intel Sandy Bridge-EP QPI
uncore PMU
#include <perfmon/pfmlib.h>
PMU name: snbep_unc_qpi0, snbep_unc_qpi1
PMU desc: Intel Sandy Bridge-EP QPI uncore PMU
The library supports the Intel Sandy Bridge Power QPI uncore PMU.
This PMU model only exists on Sandy Bridge model 45. There are two
QPI PMUs per processor socket.
The following modifiers are supported on Intel Sandy Bridge QPI
uncore PMU:
i Invert the meaning of the event. The counter will now count
QPI 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 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 QPI 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].
Stephane Eranian <eranian@gmail.com>
This page is part of the perfmon2 (a performance monitoring library)
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August, 2012 LIBPFM(3)