Reference Number: 327043-001 123
Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
2.9.6 R3QPI Box Common Metrics (Derived Events)
The following table summarizes metrics commonly calculated from R3QPI Box events.
2.9.7 R3QPI Box Performance Monitor Event List
The section enumerates the performance monitoring events for the R3QPI Box.
CLOCKTICKS
• Title: Number of uclks in domain
• Category: UCLK Events
• Event Code: 0x1
• Max. Inc/Cyc: , Register Restrictions: 0-2
• Definition: Counts the number of uclks in the Intel® QPI uclk domain. This could be slightly dif-
ferent than the count in the Ubox because of enable/freeze delays. However, because the Intel®
QPI Agent is close to the Ubox, they generally should not diverge by more than a handful of cycles.
IIO_CREDITS_ACQUIRED
• Title: to IIO BL Credit Acquired
• Category: IIO_CREDITS Events
• Event Code: 0x20
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition: Counts the number of times the NCS/NCB/DRS credit is acquried in the Intel® QPI for
sending messages on BL to the IIO. There is one credit for each of these three message classes
(three credits total). NCS is used for reads to PCIe space, NCB is used for transfering data without
coherency, and DRS is used for transfering data with coherency (cachable PCI transactions). This
event can only track one message class at a time.
IIO_CREDITS_REJECT
• Title: to IIO BL Credit Rejected
• Category: IIO_CREDITS Events
• Event Code: 0x21
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition: Counts the number of times that a request attempted to acquire an NCS/NCB/DRS
credit in the Intel® QPI for sending messages on BL to the IIO but was rejected because no credit
was available. There is one credit for each of these three message classes (three credits total).
NCS is used for reads to PCIe space, NCB is used for transfering data without coherency, and DRS is
Table 2-123. Metrics Derived from R3QPI Events
Symbol Name:
Definition
Equation
QPI_RDS_TO_RING_IN_BYTES:
QPI Reads, data transmitted to Ring in
Bytes
TxR_INSERTS.BL * 32
Table 2-124. Unit Masks for IIO_CREDITS_ACQUIRED
Extension
umask
[15:8]
Description
DRS bxxxx1xxx
NCB bxxx1xxxx
NCS bxx1xxxxx
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