19-82 Vol. 3B

PERFORMANCE-MONITORING EVENTS

40H

10H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.SNOOP.LINK_1

Counts cycles the Quickpath outbound link 1 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

20H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.NDR.LINK_1

Counts cycles the Quickpath outbound link 1 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

07H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.LINK_0

Counts cycles the Quickpath outbound link 0 virtual 

channels are 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

38H

UNC_QPI_TX_STALLED_SINGL

E_FLIT.LINK_1

Counts cycles the Quickpath outbound link 1 virtual 

channels are 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.

41H

01H

UNC_QPI_TX_STALLED_MULTI

_FLIT.DRS.LINK_0

Counts cycles the Quickpath outbound link 0 Data 

Response virtual channel is stalled due to lack of VNA 

and VN0 credits. 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.

41H

02H

UNC_QPI_TX_STALLED_MULTI

_FLIT.NCB.LINK_0

Counts cycles the Quickpath outbound link 0 Non-

Coherent Bypass virtual channel is stalled due to lack 

of VNA and VN0 credits. 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.

41H

04H

UNC_QPI_TX_STALLED_MULTI

_FLIT.NCS.LINK_0

Counts cycles the Quickpath outbound link 0 Non-

Coherent Standard virtual channel is stalled due to lack 

of VNA and VN0 credits. 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.

41H

08H

UNC_QPI_TX_STALLED_MULTI

_FLIT.DRS.LINK_1

Counts cycles the Quickpath outbound link 1 Data 

Response virtual channel is stalled due to lack of VNA 

and VN0 credits. 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.

41H

10H

UNC_QPI_TX_STALLED_MULTI

_FLIT.NCB.LINK_1

Counts cycles the Quickpath outbound link 1 Non-

Coherent Bypass virtual channel is stalled due to lack 

of VNA and VN0 credits. 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