This is a list of Pentium Pro core CPU's performance counter event types. Please see the Intel Architecture 32 Family Developer's Manual, Volume 3, Appendix A.
| Name | Description | Counters usable | Unit mask options |
| CPU_CLK_UNHALTED | clocks processor is not halted | all | |
| DATA_MEM_REFS | all memory references, cachable and non | all | |
| DCU_LINES_IN | total lines allocated in the DCU | all | |
| DCU_M_LINES_IN | number of M state lines allocated in DCU | all | |
| DCU_M_LINES_OUT | number of M lines evicted from the DCU | all | |
| DCU_MISS_OUTSTANDING | number of cycles while DCU miss outstanding | all | |
| IFU_IFETCH | number of non/cachable instruction fetches | all | |
| IFU_IFETCH_MISS | number of instruction fetch misses | all | |
| ITLB_MISS | number of ITLB misses | all | |
| IFU_MEM_STALL | cycles instruction fetch pipe is stalled | all | |
| ILD_STALL | cycles instruction length decoder is stalled | all | |
| L2_IFETCH | number of L2 instruction fetches | all |
0x08: (M)odified cache state
0x04: (E)xclusive cache state 0x02: (S)hared cache state 0x01: (I)nvalid cache state 0x0f: All cache states |
| L2_LD | number of L2 data loads | all |
0x08: (M)odified cache state
0x04: (E)xclusive cache state 0x02: (S)hared cache state 0x01: (I)nvalid cache state 0x0f: All cache states |
| L2_ST | number of L2 data stores | all |
0x08: (M)odified cache state
0x04: (E)xclusive cache state 0x02: (S)hared cache state 0x01: (I)nvalid cache state 0x0f: All cache states |
| L2_LINES_IN | number of allocated lines in L2 | all | |
| L2_LINES_OUT | number of recovered lines from L2 | all | |
| L2_M_LINES_INM | number of modified lines allocated in L2 | all | |
| L2_M_LINES_OUTM | number of modified lines removed from L2 | all | |
| L2_RQSTS | number of L2 requests | all |
0x08: (M)odified cache state
0x04: (E)xclusive cache state 0x02: (S)hared cache state 0x01: (I)nvalid cache state 0x0f: All cache states |
| L2_ADS | number of L2 address strobes | all | |
| L2_DBUS_BUSY | number of cycles data bus was busy | all | |
| L2_DBUS_BUSY_RD | cycles data bus was busy in xfer from L2 to CPU | all | |
| BUS_DRDY_CLOCKS | number of clocks DRDY is asserted | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_LOCK_CLOCKS | number of clocks LOCK is asserted | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_REQ_OUTSTANDING | number of outstanding bus requests | all | |
| BUS_TRAN_BRD | number of burst read transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_RFO | number of read for ownership transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRANS_WB | number of write back transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_IFETCH | number of instruction fetch transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_INVAL | number of invalidate transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_PWR | number of partial write transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRANS_P | number of partial transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRANS_IO | number of I/O transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRANS_DEF | number of deferred transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_BURST | number of burst transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_ANY | number of all transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_TRAN_MEM | number of memory transactions | all |
0x00: self-generated transactions
0x20: any transactions |
| BUS_DATA_RCV | bus cycles this processor is receiving data | all | |
| BUS_BNR_DRV | bus cycles this processor is driving BNR pin | all | |
| BUS_HIT_DRV | bus cycles this processor is driving HIT pin | all | |
| BUS_HITM_DRV | bus cycles this processor is driving HITM pin | all | |
| BUS_SNOOP_STALL | cycles during bus snoop stall | all | |
| COMP_FLOP_RET | number of computational FP operations retired | 0 | |
| FLOPS | number of computational FP operations executed | 0 | |
| FP_ASSIST | number of FP exceptions handled by microcode | 1 | |
| MUL | number of multiplies | 1 | |
| DIV | number of divides | 1 | |
| CYCLES_DIV_BUSY | cycles divider is busy | 0 | |
| LD_BLOCKS | number of store buffer blocks | all | |
| SB_DRAINS | number of store buffer drain cycles | all | |
| MISALIGN_MEM_REF | number of misaligned data memory references | all | |
| INST_RETIRED | number of instructions retired | all | |
| UOPS_RETIRED | number of UOPs retired | all | |
| INST_DECODED | number of instructions decoded | all | |
| HW_INT_RX | number of hardware interrupts received | all | |
| CYCLES_INT_MASKED | cycles interrupts are disabled | all | |
| CYCLES_INT_PENDING_AND_MASKED | cycles interrupts are disabled with pending interrupts | all | |
| BR_INST_RETIRED | number of branch instructions retired | all | |
| BR_MISS_PRED_RETIRED | number of mispredicted branches retired | all | |
| BR_TAKEN_RETIRED | number of taken branches retired | all | |
| BR_MISS_PRED_TAKEN_RET | number of taken mispredictions branches retired | all | |
| BR_INST_DECODED | number of branch instructions decoded | all | |
| BTB_MISSES | number of branches that miss the BTB | all | |
| BR_BOGUS | number of bogus branches | all | |
| BACLEARS | number of times BACLEAR is asserted | all | |
| RESOURCE_STALLS | cycles during resource related stalls | all | |
| PARTIAL_RAT_STALLS | cycles or events for partial stalls | all | |
| SEGMENT_REG_LOADS | number of segment register loads | all |
Premature optimization is the root of all evil.- Tony Hoare