Intel Pentium II

This is a list of Pentium II 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
MMX_INSTR_EXEC	number of MMX instructions executed	all
MMX_SAT_INSTR_EXEC	number of MMX saturating instructions executed	all
MMX_UOPS_EXEC	number of MMX UOPS executed	all	0x0f: mandatory
MMX_INSTR_TYPE_EXEC	number of MMX packing instructions	all	0x01: MMX packed multiplies 0x02: MMX packed shifts 0x04: MMX pack operations 0x08: MMX unpack operations 0x10: MMX packed logical 0x20: MMX packed arithmetic 0x3f: all of the above
FP_MMX_TRANS	MMX-floating point transitions	all	0x00: MMX->float operations 0x01: float->MMX operations
MMX_ASSIST	number of EMMS instructions executed	all
MMX_INSTR_RET	number of MMX instructions retired	all
SEG_RENAME_STALLS	number of segment register renaming stalls	all	0x01: ES register 0x02: DS register 0x04: FS register 0x08: GS register 0x0f: ES, DS, FS, GS registers
SEG_REG_RENAMES	number of segment register renames	all	0x01: ES register 0x02: DS register 0x04: FS register 0x08: GS register 0x0f: ES, DS, FS, GS registers
RET_SEG_RENAMES	number of segment register rename events retired	all