10-23-2007
Thanks for the reply..
Just noticed that it is an AIX forum, I hope the answer is valid in HPUX (and others) too..
Thanks Bakunin
Hope to see you on the Bridge table
BBO: OllieBond
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libpfm_intel_snbep_unc_pcu
LIBPFM(3) Linux Programmer's Manual LIBPFM(3)
NAME
libpfm_intel_snbep_unc_pcu - support for Intel Sandy Bridge-EP Power Controller Unit (PCU) uncore PMU
SYNOPSIS
#include <perfmon/pfmlib.h>
PMU name: snbep_unc_pcu
PMU desc: Intel Sandy Bridge-EP PCU uncore PMU
DESCRIPTION
The library supports the Intel Sandy Bridge Power Controller Unit uncore PMU. This PMU model only exists on Sandy Bridge model 45. There
is only one PCU PMU per processor socket.
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 HA cycles in which the event is not occurring. This is a boolean modi-
fier
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 HA 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 [0:15].
ff Enable frequency band filtering. This modifier applies only to the UNC_P_FREQ_BANDx_CYCLES events, where x is [0-3]. The modifiers
expects an integer in the range [0-255]. The value is interpreted as a frequency value to be multipled by 100Mhz. Thus if the value
is 32, then all cycles where the processor is running at 3.2GHz and more are counted.
Frequency band filtering
There are 3 events which support frequency band filtering, namely, UNC_P_FREQ_BAND0_CYCLES, UNC_P_FREQ_BAND1_CYCLES,
UNC_P_FREQ_BAND2_CYCLES, UNC_P_FREQ_BAND3_CYCLES. The frequency filter (available via the ff modifier) is stored into a PMU shared register
which hold all 4 possible frequency bands, one per event. However, the library generate the encoding for each event individually because it
processes events one at a time. The caller or the underlying kernel interface may have to merge the band filter settings to program the
filter register properly.
AUTHORS
Stephane Eranian <eranian@gmail.com>
August, 2012 LIBPFM(3)