Intel Xeon E5-2600 Series - Page 128

Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
128 Reference Number: 327043-001
TxR_CYCLES_NE
• Title: Egress Cycles Not Empty
• Category: EGRESS Events
• Event Code: 0x23
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition: Counts the number of cycles when the Intel® QPI Egress is not empty. This tracks one
of the three rings that are used by the Intel® QPI agent. This can be used in conjunction with the
Intel® QPI Egress Occupancy Accumulator event in order to calculate average queue occupancy.
Only a single Egress queue can be tracked at any given time. It is not possible to filter based on
direction or polarity.
TxR_INSERTS
• Title: Egress Allocations
• Category: EGRESS Events
• Event Code: 0x24
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition: Counts the number of allocations into the Intel® QPI Egress. This tracks one of the
three rings that are used by the Intel® QPI agent. This can be used in conjunction with the Intel®
QPI Egress Occupancy Accumulator event in order to calculate average queue latency. Only a single
Egress queue can be tracked at any given time. It is not possible to filter based on direction or
polarity.
TxR_NACK
• Title: Egress NACK
• Category: EGRESS Events
• Event Code: 0x26
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition:
VN0_CREDITS_REJECT
• Title: VN0 Credit Acquisition Failed on DRS
• Category: LINK_VN0_CREDITS Events
• Event Code: 0x37
• Max. Inc/Cyc: 1, Register Restrictions: 0-1
• Definition: Number of times a request failed to acquire a DRS VN0 credit. In order for a request to
be transferred across Intel® QPI, it must be guaranteed to have a flit buffer on the remote socket
to sink into. There are two credit pools, VNA and VN0. VNA is a shared pool used to achieve high
performance. The VN0 pool has reserved entries for each message class and is used to prevent
deadlock. Requests first attempt to acquire a VNA credit, and then fall back to VN0 if they fail. This
therefore counts the number of times when a request failed to acquire either a VNA or VN0 credit
and is delayed. This should generally be a rare situation.
Table 2-139. Unit Masks for VN0_CREDITS_REJECT (Sheet 1 of 2)
Extension
umask
[15:8]
Description
HOM bxxxxxxx1 HOM Message Class:
Filter for the Home (HOM) message class. HOM is generally used to
send requests, request responses, and snoop responses.
SNP bxxxxxx1x SNP Message Class:
Filter for Snoop (SNP) message class. SNP is used for outgoing
snoops. Note that snoop responses flow on the HOM message class.