Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
106
Reference Number: 327043-001
RxL_OCCUPANCY_NCB
• Title:
RxQ Occupancy - NCB
• Category:
RXQ Events
• Event Code:
0x16
• Extra Select Bit:
Y
• Max. Inc/Cyc:
128,
Register Restrictions:
0-3
• Definition:
Accumulates the number of elements in the Intel® QPI RxQ in each cycle. Generally,
when data is transmitted across Intel® QPI, it will bypass the RxQ and pass directly to the ring
interface. If things back up getting transmitted onto the ring, however, it may need to allocate into
this buffer, thus increasing the latency. This event can be used in conjunction with the Flit Buffer
Not Empty event to calculate average occupancy, or with the Flit Buffer Allocations event to track
average lifetime. This monitors NCB flits only.
RxL_OCCUPANCY_NCS
• Title:
RxQ Occupancy - NCS
• Category:
RXQ Events
• Event Code:
0x17
• Extra Select Bit:
Y
• Max. Inc/Cyc:
128,
Register Restrictions:
0-3
• Definition:
Accumulates the number of elements in the Intel® QPI RxQ in each cycle. Generally,
when data is transmitted across Intel® QPI, it will bypass the RxQ and pass directly to the ring
interface. If things back up getting transmitted onto the ring, however, it may need to allocate into
this buffer, thus increasing the latency. This event can be used in conjunction with the Flit Buffer
Not Empty event to calculate average occupancy, or with the Flit Buffer Allocations event to track
average lifetime. This monitors NCS flits only.
RxL_OCCUPANCY_NDR
• Title:
RxQ Occupancy - NDR
• Category:
RXQ Events
• Event Code:
0x1A
• Extra Select Bit:
Y
• Max. Inc/Cyc:
128,
Register Restrictions:
0-3
• Definition:
Accumulates the number of elements in the Intel® QPI RxQ in each cycle. Generally,
when data is transmitted across Intel® QPI, it will bypass the RxQ and pass directly to the ring
interface. If things back up getting transmitted onto the ring, however, it may need to allocate into
this buffer, thus increasing the latency. This event can be used in conjunction with the Flit Buffer
Not Empty event to calculate average occupancy, or with the Flit Buffer Allocations event to track
average lifetime. This monitors NDR flits only.
RxL_OCCUPANCY_SNP
• Title:
RxQ Occupancy - SNP
• Category:
RXQ Events
• Event Code:
0x19
• Extra Select Bit:
Y
• Max. Inc/Cyc:
128,
Register Restrictions:
0-3
• Definition:
Accumulates the number of elements in the Intel® QPI RxQ in each cycle. Generally,
when data is transmitted across Intel® QPI, it will bypass the RxQ and pass directly to the ring
interface. If things back up getting transmitted onto the ring, however, it may need to allocate into
this buffer, thus increasing the latency. This event can be used in conjunction with the Flit Buffer
Not Empty event to calculate average occupancy, or with the Flit Buffer Allocations event to track
average lifetime. This monitors SNP flits only.
