.TH LIBPFM 3  "August, 2012" "" "Linux Programmer's Manual"
.SH NAME
libpfm_intel_snb_unc - support for Intel Sandy Bridge uncore PMU
.SH SYNOPSIS
.nf
.B #include <perfmon/pfmlib.h>
.sp
.B PMU name: snb_unc_cbo0, snb_unc_cbo1, snb_unc_cbo2, snb_unc_cbo3
.B PMU desc: Intel Sandy Bridge C-box uncore
.sp
.SH 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: \fBUNC_CLOCKTICKS\fR.


.SH MODIFIERS
The following modifiers are supported on Intel Sandy Bridge C-Box uncore PMU:
.TP
.B i
Invert the meaning of the event. The counter will now count cycles in which the event is \fBnot\fR
occurring. This is a boolean modifier
.TP
.B 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.
.TP
.B 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].

.P
Both the \fBUNC_CBO_CACHE_LOOKUP\fR and \fBUNC_CBO_XSNP_RESPONSE\fR requires two umasks to be valid.
For \fBUNC_CBO_CACHE_LOOKUP\fR the first umask must be one of the MESI state umasks, the second has to be one
of the filters.  For \fBUNC_CBO_XSNP_RESPONSE\fR the first umask must be one of the snoop types, the second
has to be one of the filters.

.SH AUTHORS
.nf
Stephane Eranian <eranian@gmail.com>
.if
.PP