The library supports the Intel Ivy Bridge client part (model 58)
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.
The following modifiers are supported on Intel Ivy Bridge C-Box
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.
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@example.com. This page was obtained
from the project's upstream Git repository
⟨git://git.code.sf.net/p/perfmon2/libpfm4 perfmon2-libpfm4⟩ on
2021-04-01. (At that time, the date of the most recent commit
that was found in the repository was 2021-03-23.) 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
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June, 2013 LIBPFM(3)