Reference Number: 327043-001 105
Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
RxL_INSERTS_SNP
• Title: Rx Flit Buffer Allocations - SNP
• Category: RXQ Events
• Event Code: 0x0D
• Extra Select Bit: Y
• Max. Inc/Cyc: 1, Register Restrictions: 0-3
• Definition: Number of allocations into the Intel® QPI Rx Flit Buffer. Generally, when data is trans-
mitted 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 Occupancy event
in order to calculate the average flit buffer lifetime. This monitors only SNP flits.
RxL_OCCUPANCY
• Title: RxQ Occupancy - All Packets
• Category: RXQ Events
• Event Code: 0x0B
• 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.
RxL_OCCUPANCY_DRS
• Title: RxQ Occupancy - DRS
• Category: RXQ Events
• Event Code: 0x15
• 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 DRS flits only.
RxL_OCCUPANCY_HOM
• Title: RxQ Occupancy - HOM
• Category: RXQ Events
• Event Code: 0x18
• 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 HOM flits only.
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