Uncore Manual

Uncore Performance Monitoring
Power Control (PCU) Performance Monitoring
130 Reference Number: 329468-002
• Definition: Counts the number of cycles that we are in external PROCHOT mode. This mode is trig-
gered when a sensor off the die determines that something off-die (like DRAM) is too hot and must
throttle to avoid damaging the chip.
PROCHOT_INTERNAL_CYCLES
• Title: Internal Prochot
• Category: PROCHOT Events
• Event Code: 0x09
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of cycles that we are in Internal PROCHOT mode. This mode is trig-
gered when a sensor on the die determines that we are too hot and must throttle to avoid damaging
the chip.
TOTAL_TRANSITION_CYCLES
• Title: Total Core C State Transition Cycles
• Category: CORE_C_STATE_TRANSITION Events
• Event Code: 0x63
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Number of cycles spent performing core C state transitions across all cores.
VOLT_TRANS_CYCLES_CHANGE
• Title: Cycles Changing Voltage
• Category: VOLT_TRANS Events
• Event Code: 0x03
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of cycles when the system is changing voltage. There is no filtering
supported with this event. One can use it as a simple event, or use it conjunction with the occu-
pancy events to monitor the number of cores or threads that were impacted by the transition. This
event is calculated by OR’ing together the increasing and decreasing events.
VOLT_TRANS_CYCLES_DECREASE
• Title: Cycles Decreasing Voltage
• Category: VOLT_TRANS Events
• Event Code: 0x02
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of cycles when the system is decreasing voltage. There is no filter-
ing supported with this event. One can use it as a simple event, or use it conjunction with the occu-
pancy events to monitor the number of cores or threads that were impacted by the transition.
VOLT_TRANS_CYCLES_INCREASE
• Title: Cycles Increasing Voltage
• Category: VOLT_TRANS Events
• Event Code: 0x01
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of cycles when the system is increasing voltage. There is no filter-
ing supported with this event. One can use it as a simple event, or use it conjunction with the occu-
pancy events to monitor the number of cores or threads that were impacted by the transition.