Vol. 3B 19-115

PERFORMANCE-MONITORING EVENTS

63H

20H

UNC_DRAM_READ_CAS.AUTO

PRE_CH2

Counts the number of times a read CAS command was 

issued on DRAM channel 2 where the command issued 

used the auto-precharge (auto page close) mode.

64H

01H

UNC_DRAM_WRITE_CAS.CH0

Counts the number of times a write CAS command was 

issued on DRAM channel 0.

64H

02H

UNC_DRAM_WRITE_CAS.AUTO

PRE_CH0

Counts the number of times a write CAS command was 

issued on DRAM channel 0 where the command issued 

used the auto-precharge (auto page close) mode.

64H

04H

UNC_DRAM_WRITE_CAS.CH1

Counts the number of times a write CAS command was 

issued on DRAM channel 1.

64H

08H

UNC_DRAM_WRITE_CAS.AUTO

PRE_CH1

Counts the number of times a write CAS command was 

issued on DRAM channel 1 where the command issued 

used the auto-precharge (auto page close) mode.

64H

10H

UNC_DRAM_WRITE_CAS.CH2

Counts the number of times a write CAS command was 

issued on DRAM channel 2.

64H

20H

UNC_DRAM_WRITE_CAS.AUTO

PRE_CH2

Counts the number of times a write CAS command was 

issued on DRAM channel 2 where the command issued 

used the auto-precharge (auto page close) mode.

65H

01H

UNC_DRAM_REFRESH.CH0

Counts number of DRAM channel 0 refresh commands. 

DRAM loses data content over time. In order to keep 

correct data content, the data values have to be 

refreshed periodically.

65H

02H

UNC_DRAM_REFRESH.CH1

Counts number of DRAM channel 1 refresh commands. 

DRAM loses data content over time. In order to keep 

correct data content, the data values have to be 

refreshed periodically.

65H

04H

UNC_DRAM_REFRESH.CH2

Counts number of DRAM channel 2 refresh commands. 

DRAM loses data content over time. In order to keep 

correct data content, the data values have to be 

refreshed periodically.

66H

01H

UNC_DRAM_PRE_ALL.CH0

Counts number of DRAM Channel 0 precharge-all 

(PREALL) commands that close all open pages in a rank. 

PREALL is issued when the DRAM needs to be 

refreshed or needs to go into a power down mode.

66H

02H

UNC_DRAM_PRE_ALL.CH1

Counts number of DRAM Channel 1 precharge-all 

(PREALL) commands that close all open pages in a rank. 

PREALL is issued when the DRAM needs to be 

refreshed or needs to go into a power down mode.

66H

04H

UNC_DRAM_PRE_ALL.CH2

Counts number of DRAM Channel 2 precharge-all 

(PREALL) commands that close all open pages in a rank. 

PREALL is issued when the DRAM needs to be 

refreshed or needs to go into a power down mode.

67H

01H

UNC_DRAM_THERMAL_THROT

TLED

Uncore cycles DRAM was throttled due to its 

temperature being above the thermal throttling 

threshold.

80H

01H

UNC_THERMAL_THROTTLING_

TEMP.CORE_0

Cycles that the PCU records that core 0 is above the 

thermal throttling threshold temperature.

Table 19-20.  Non-Architectural Performance Events In the Processor Uncore for 

Processors Based on Intel® Microarchitecture Code Name Westmere (Contd.)

Event

Num.

Umask

Value

Event Mask Mnemonic

Description

Comment