\page ivybridge Intel® IvyBridge

# Available performance monitors for the Intel® IvyBridge microarchitecture

- \ref IVB_FIXED "Fixed-purpose counters"
- \ref IVB_PMC "General-purpose counters"
- \ref IVB_THERMAL "Thermal counters"
- \ref IVB_POWER "Power measurement counters"
- \ref IVB_UBOX "Uncore global counters"
- \ref IVB_CBOX "Last level cache counters"

# Counters available for each hardware thread

\anchor IVB_FIXED

## Fixed-purpose counters

Since the Core2 microarchitecture, Intel® provides a set of fixed-purpose counters. Each can measure only one specific event.

### Counter and events

Counter name | Event name
--- | ---
FIXC0 | INSTR_RETIRED_ANY
FIXC1 | CPU_CLK_UNHALTED_CORE
FIXC2 | CPU_CLK_UNHALTED_REF

### Available Options

Option | Argument | Description | Comment
--- | --- | --- | ---
anythread | N | Set bit 2+(index*4) in config register |
kernel | N | Set bit (index*4) in config register |

\anchor IVB_PMC

## General-purpose counters

The Intel® IvyBridge microarchitecture provides 4 general-purpose counters consisting of a config and a counter register.

### Counter and events

Counter name | Event name
--- | ---
PMC0 | *
PMC1 | *
PMC2 | *
PMC3 | *

### Available Options

Option | Argument | Description | Comment
--- | --- | --- | ---
edgedetect | N | Set bit 18 in config register |
kernel | N | Set bit 17 in config register |
anythread | N | Set bit 21 in config register |
threshold | 8 bit hex value | Set bits 24-31 in config register |
invert | N | Set bit 23 in config register |

### Special handling for events

The Intel® IvyBridge microarchitecture provides measuring of offcore events in PMC counters. Therefore the stream of offcore events must be filtered using the OFFCORE_RESPONSE registers. The Intel® IvyBridge microarchitecture has two of those registers. LIKWID defines some events that perform the filtering according to the event name. Although there are many bitmasks possible, LIKWID natively provides only the ones with response type ANY. Own filtering can be applied with the OFFCORE_RESPONSE_0_OPTIONS and OFFCORE_RESPONSE_1_OPTIONS events. Only for those events two more counter options are available:

Option | Argument | Description | Comment
--- | --- | --- | ---
match0 | 16 bit hex value | Input value masked with 0x8FFF and written to bits 0-15 in the OFFCORE_RESPONSE register | Check the Intel® Software Developer System Programming Manual, Vol. 3, Chapter Performance Monitoring and https://download.01.org/perfmon/IVB.
match1 | 22 bit hex value | Input value is written to bits 16-37 in the OFFCORE_RESPONSE register | Check the Intel® Software Developer System Programming Manual, Vol. 3, Chapter Performance Monitoring and https://download.01.org/perfmon/IVB.

\anchor IVB_THERMAL

## Thermal counter

The Intel® IvyBridge microarchitecture provides one register for the current core temperature.

### Counter and events

Counter name | Event name
--- | ---
TMP0 | TEMP_CORE

# Counters available for one hardware thread per socket

\anchor IVB_POWER

## Power counter

The Intel® IvyBridge microarchitecture provides measurements of the current power consumption through the RAPL interface.

### Counter and events

Counter name | Event name
--- | ---
PWR0 | PWR_PKG_ENERGY
PWR1 | PWR_PP0_ENERGY
PWR2* | PWR_PP1_ENERGY
PWR3 | PWR_DRAM_ENERGY

*) The PWR2 counter is often not implemented by Intel® IvyBridge systems

\anchor IVB_UBOX

## Uncore global counters

The Intel® IvyBridge microarchitecture provides measurements for the global uncore.

### Counter and events

Counter name | Event name
--- | ---
UBOX0 | *
UBOX1 | *
UBOXFIX | UNCORE_CLOCK

### Available Options

Option | Argument | Description | Comment
--- | --- | --- | ---
edgedetect | N | Set bit 18 in config register |
threshold | 8 bit hex value | Set bits 24-28 in config register |
invert | N | Set bit 23 in config register |

\anchor IVB_CBOX

## Last level cache counters

The Intel® IvyBridge microarchitecture provides measurements for the last level cache segments.

### Counter and events

Counter name | Event name
--- | ---
CBOX<0-3>C0 | *
CBOX<0-3>C1 | *

### Available Options

Option | Argument | Description | Comment
--- | --- | --- | ---
edgedetect | N | Set bit 18 in config register |
threshold | 8 bit hex value | Set bits 24-28 in config register |
invert | N | Set bit 23 in config register |