Vol. 3B 19-81

PERFORMANCE-MONITORING EVENTS

30H

04H

UNC_QMC_CANCEL.CH2

Counts number of DRAM channel 2 cancel requests.

30H

07H

UNC_QMC_CANCEL.ANY

Counts number of DRAM cancel requests.

31H

01H

UNC_QMC_PRIORITY_UPDATE

S.CH0

Counts number of DRAM channel 0 priority updates. A 

priority update occurs when an ISOC high or critical 

request is received by the QHL and there is a matching 

request with normal priority that has already been 

issued to the QMC.  In this instance, the QHL will send 

a priority update to QMC to expedite the request.

31H

02H

UNC_QMC_PRIORITY_UPDATE

S.CH1

Counts number of DRAM channel 1 priority updates. A 

priority update occurs when an ISOC high or critical 

request is received by the QHL and there is a matching 

request with normal priority that has already been 

issued to the QMC. In this instance, the QHL will send a 

priority update to QMC to expedite the request.

31H

04H

UNC_QMC_PRIORITY_UPDATE

S.CH2

Counts number of DRAM channel 2 priority updates. A 

priority update occurs when an ISOC high or critical 

request is received by the QHL and there is a matching 

request with normal priority that has already been 

issued to the QMC.  In this instance, the QHL will send 

a priority update to QMC to expedite the request.

31H

07H

UNC_QMC_PRIORITY_UPDATE

S.ANY

Counts number of DRAM priority updates. A priority 

update occurs when an ISOC high or critical request is 

received by the QHL and there is a matching request 

with normal priority that has already been issued to 

the QMC. In this instance, the QHL will send a priority 

update to QMC to expedite the request.

33H

04H

UNC_QHL_FRC_ACK_CNFLTS.L

OCAL

Counts number of Force Acknowledge Conflict 

messages sent by the Quickpath Home Logic to the 

local home.

40H

01H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.HOME.LINK_0

Counts cycles the Quickpath outbound link 0 HOME 

virtual channel is stalled due to lack of a VNA and VN0 

credit. Note that this event does not filter out when a 

flit would not have been selected for arbitration 

because another virtual channel is getting arbitrated.

40H

02H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.SNOOP.LINK_0

Counts cycles the Quickpath outbound link 0 SNOOP 

virtual channel is stalled due to lack of a VNA and VN0 

credit. Note that this event does not filter out when a 

flit would not have been selected for arbitration 

because another virtual channel is getting arbitrated.

40H

04H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.NDR.LINK_0

Counts cycles the Quickpath outbound link 0 non-data 

response virtual channel is stalled due to lack of a VNA 

and VN0 credit. Note that this event does not filter out 

when a flit would not have been selected for 

arbitration because another virtual channel is getting 

arbitrated.

40H

08H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.HOME.LINK_1

Counts cycles the Quickpath outbound link 1 HOME 

virtual channel is stalled due to lack of a VNA and VN0 

credit. Note that this event does not filter out when a 

flit would not have been selected for arbitration 

because another virtual channel is getting arbitrated.

Table 19-18.  Non-Architectural Performance Events In the Processor Uncore for 

Intel® Core™ i7 Processor and Intel® Xeon® Processor 5500 Series (Contd.)

Event

Num.

Umask

Value

Event Mask Mnemonic

Description

Comment