The Queues; Cbo Events Ordered By Code - Intel Xeon E5-2600 Series Monitoring Manual

Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
AK (Acknowledge) Ring - Acknowledges Intel® QPI to CBo and CBo to Core. Carries snoop responses
from Core to CBo.
IV (Invalidate) Ring - CBo Snoop requests of core caches
Internal CBo Queues:
IRQ - Ingress Request Queue on AD Ring. Associated with requests from core.
IPQ - Ingress Probe Queue on AD Ring. Associated with snoops from Intel® QPI LL.
ISMQ - Ingress Subsequent Messages (response queue). Associated with messages responses to
ingress requests (e.g. data responses, Intel QPI complete messages, core snoop response messages
and GO reset queue).
TOR - Table Of Requests. Tracks pending CBo transactions.
RxR (aka IGR) - "Receive from Ring" referring to Ingress (requests from the Cores) queues.
TxR (aka EGR) - "Transmit to Ring" referring to Egress (requests headed for the Ring) queues.
2.3.4.3

The Queues:

There are several internal occupancy queue counters, each of which is 5bits wide and dedicated to its
queue: IRQ, IPQ, ISMQ, QPI_IGR, IGR, EGR and the TOR.
2.3.5

CBo Events Ordered By Code

The following table summarizes the directly measured CBO Box events.
Table 2-14. Performance Monitor Events for CBO (Sheet 1 of 2)
CLOCKTICKS
TxR_INSERTS
TxR_ADS_USED
RING_BOUNCES
RING_SRC_THRTL
RxR_OCCUPANCY
RxR_EXT_STARVED
RxR_INSERTS
RING_AD_USED
RING_AK_USED
RING_BL_USED
RING_IV_USED
COUNTER0_OCCUPANCY
ISMQ_DRD_MISS_OCC
RxR_IPQ_RETRY
RxR_IRQ_RETRY
Reference Number: 327043-001
Event
Symbol Name
Code
0x00
0x02
0x04
0x05
0x07
0x11
0x12
0x13
0x1B
0x1C
0x1D
0x1E
0x1F
0x21
0x31
0x32
Max
Ctrs Inc/
Cyc
0-3 1 Uncore Clocks
0-1 1 Egress Allocations
0-1 1
0-1 1 Number of LLC responses that bounced on
the Ring.
0-1 1
0 20 Ingress Occupancy
0-1 1 Ingress Arbiter Blocking Cycles
0-1 1 Ingress Allocations
2-3 1 AD Ring In Use
2-3 1 AK Ring In Use
2-3 1 BL Ring in Use
2-3 1 BL Ring in Use
1-3 20 Counter 0 Occupancy
0-1 20
0-1 1 Probe Queue Retries
0-1 1 Ingress Request Queue Rejects
Description
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