поддержка Intel Sandy Bridge uncore PMU (support for Intel Sandy Bridge uncore PMU)
Имя (Name)
libpfm_intel_snb_unc - support for Intel Sandy Bridge uncore PMU
Синопсис (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
Описание (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.
Модификаторы (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.
