Name

Description

Counters usable

Unit mask options

CPU_CLK_UNHALTED

Clock cycles when not halted

all

UNHALTED_REFERENCE_CYCLES

Unhalted reference cycles

all

0x01: No unit mask 

INST_RETIRED

number of instructions retired

all

LLC_MISSES

Last level cache demand requests from this core that missed the LLC

all

0x41: No unit mask 

LLC_REFS

Last level cache demand requests from this core

all

0x4f: No unit mask 

BR_INST_RETIRED

number of branch instructions retired

all

BR_MISS_PRED_RETIRED

number of mispredicted branches retired (precise)

all

ld_blocks

blocked loads

all

0x01: (name=data_unknown) blocked loads due to store buffer blocks with unknown data. 

0x02: (name=store_forward) loads blocked by overlapping with store buffer that cannot be forwarded 

0x08: (name=no_sr) This event counts the number of times that split load operations are temporarily blocked because all resources for handling the split accesses are in use. 

0x10: (name=all_block) Number of cases where any load is blocked but has no DCU miss. 

misalign_mem_ref

Misaligned memory references

all

0x01: (name=loads) Speculative cache-line split load uops dispatched to the L1D. 

0x02: (name=stores) Speculative cache-line split Store-address uops dispatched to L1D 

ld_blocks_partial

Partial loads

all

0x01: (name=address_alias) False dependencies in MOB due to partial compare on address 

0x08: (name=all_sta_block) This event counts the number of times that load operations are temporarily blocked because of older stores, with addresses that are not yet known. A load operation may incur more than one block of this type. 

dtlb_load_misses

D-TLB misses

all

0x01: (name=miss_causes_a_walk) Miss in all TLB levels causes an page walk of any page size (4K/2M/4M/1G) 

0x02: (name=walk_completed) Miss in all TLB levels causes a page walk that completes of any page size (4K/2M/4M/1G) 

0x04: (name=walk_duration) Cycles PMH is busy with this walk 

0x10: (name=stlb_hit) First level miss but second level hit; no page walk. 

int_misc

Instruction decoder events

all

0x40: (name=rat_stall_cycles) Cycles Resource Allocation Table (RAT) external stall is sent to Instruction Decode Queue (IDQ) for this thread. 

0x03: (name=recovery_cycles) Number of cycles waiting to be recover after Nuke due to all other cases except JEClear. 

0x03: (name=recovery_stalls_count) Edge applied to recovery_cycles, thus counts occurrences. 

uops_issued

Number of Uops issued

all

0x01: (name=any) Number of Uops issued by the Resource Allocation Table (RAT) to the Reservation Station (RS) 

0x01: (name=stall_cycles) cycles no uops issued by this thread. 

arith

Misc ALU events

all

0x01: (name=fpu_div_active) Cycles that the divider is busy with any divide or sqrt operation. 

0x01: (name=fpu_div) Number of times that the divider is actived, includes INT, SIMD and FP. 

insts_written_to_iq

Number of instructions written to Instruction Queue (IQ) this cycle.

all

0x01: No unit mask 

l2_rqsts

Requests from L2 cache

all

0x01: (name=demand_data_rd_hit) Demand Data Read hit L2, no rejects 

0x04: (name=rfo_hit) RFO requests that hit L2 cache 

0x08: (name=rfo_miss) RFO requests that miss L2 cache 

0x10: (name=code_rd_hit) L2 cache hits when fetching instructions, code reads. 

0x20: (name=code_rd_miss) L2 cache misses when fetching instructions 

0x40: (name=pf_hit) Requests from the L2 hardware prefetchers that hit L2 cache 

0x80: (name=pf_miss) Requests from the L2 hardware prefetchers that miss L2 cache 

0x03: (name=all_demand_data_rd) Any data read request to L2 cache 

0x0c: (name=all_rfo) Any data RFO request to L2 cache 

0x30: (name=all_code_rd) Any code read request to L2 cache 

0xc0: (name=all_pf) Any L2 HW prefetch request to L2 cache 

l2_store_lock_rqsts

L2 cache store lock requests

all

0x0f: (name=all) RFOs that access cache lines in any state 

0x01: (name=miss) RFO (as a result of regular RFO or Lock request) miss cache - I state 

0x04: (name=hit_e) RFO (as a result of regular RFO or Lock request) hits cache in E state 

0x08: (name=hit_m) RFO (as a result of regular RFO or Lock request) hits cache in M state 

l2_l1d_wb_rqsts

writebacks from L1D to the L2 cache

all

0x04: (name=hit_e) writebacks from L1D to L2 cache lines in E state 

0x01: (name=pending) Cycles with L1D load Misses outstanding. 

0x01: (name=occurences) This event counts the number of L1D misses outstanding occurences. 

dtlb_store_misses

D-TLB store misses

all

0x01: (name=miss_causes_a_walk) Miss in all TLB levels causes an page walk of any page size (4K/2M/4M/1G) 

0x02: (name=walk_completed) Miss in all TLB levels causes a page walk that completes of any page size (4K/2M/4M/1G) 

0x04: (name=walk_duration) Cycles PMH is busy with this walk 

0x10: (name=stlb_hit) First level miss but second level hit; no page walk. Only relevant if multiple levels. 

load_hit_pre

Load dispatches that hit fill buffer

all

0x01: (name=sw_pf) Load dispatches that hit fill buffer allocated for S/W prefetch. 

0x02: (name=hw_pf) Load dispatches that hit fill buffer allocated for HW prefetch. 

hw_pre_req

Hardware Prefetch requests

all

0x02: No unit mask 

l1d

L1D cache events

all

0x01: (name=replacement) L1D Data line replacements. 

0x02: (name=allocated_in_m) L1D M-state Data Cache Lines Allocated 

0x04: (name=eviction) L1D M-state Data Cache Lines Evicted due to replacement (only) 

0x08: (name=all_m_replacement) All Modified lines evicted out of L1D 

partial_rat_stalls

Partial RAT stalls

all

0x20: (name=flags_merge_uop) Number of perf sensitive flags-merge uops added by Sandy Bridge u-arch. 

0x40: (name=slow_lea_window) Number of cycles with at least 1 slow Load Effective Address (LEA) uop being allocated. 

0x80: (name=mul_single_uop) Number of Multiply packed/scalar single precision uops allocated 

0x20: (name=flags_merge_uop_cycles) Cycles with perf sensitive flags-merge uops added by SandyBridge u-arch. 

resource_stalls2

Misc resource stalls

all

0x40: (name=bob_full) Cycles Allocator is stalled due Branch Order Buffer (BOB). 

0x0f: (name=all_prf_control) Resource stalls2 control structures full for physical registers 

0x0c: (name=all_fl_empty) Cycles with either free list is empty 

0x4f: (name=ooo_rsrc) Resource stalls2 control structures full Physical Register Reclaim Table (PRRT), Physical History Table (PHT), INT or SIMD Free List (FL), Branch Order Buffer (BOB) 

cpl_cycles

Unhalted core cycles in specific rings

all

0x01: (name=ring0) Unhalted core cycles the Thread was in Rings 0. 

0x01: (name=ring0_trans) Transitions from ring123 to Ring0. 

0x02: (name=ring123) Unhalted core cycles the Thread was in Rings 1/2/3. 

rs_events

Events for the reservation station

all

0x01: No unit mask 

offcore_requests_outstanding

Offcore outstanding transactions

all

0x01: (name=demand_data_rd) Offcore outstanding Demand Data Read transactions in the SuperQueue (SQ), queue to uncore, every cycle. Includes L1D data hardware prefetches. 

0x01: (name=cycles_with_demand_data_rd) cycles there are Offcore outstanding RD data transactions in the SuperQueue (SQ), queue to uncore. 

0x02: (name=demand_code_rd) Offcore outstanding Code Reads transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

0x04: (name=demand_rfo) Offcore outstanding RFO (store) transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

0x08: (name=all_data_rd) Offcore outstanding all cacheable Core Data Read transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

0x08: (name=cycles_with_data_rd) Cycles there are Offcore outstanding all Data read transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

0x02: (name=cycles_with_demand_code_rd) Cycles with offcore outstanding Code Reads transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

0x04: (name=cycles_with_demand_rfo) Cycles with offcore outstanding demand RFO Reads transactions in the SuperQueue (SQ), queue to uncore, every cycle. 

lock_cycles

Cycles due to LOCK prefixes.

all

0x01: (name=split_lock_uc_lock_duration) Cycles in which the L1D and L2 are locked, due to a UC lock or split lock 

0x02: (name=cache_lock_duration) cycles that theL1D is locked 

idq

Instruction Decode Queue events

all

0x02: (name=empty) Cycles the Instruction Decode Queue (IDQ) is empty. 

0x04: (name=mite_uops) Number of uops delivered to Instruction Decode Queue (IDQ) from MITE path. 

0x08: (name=dsb_uops) Number of uops delivered to Instruction Decode Queue (IDQ) from Decode Stream Buffer (DSB) path. 

0x10: (name=ms_dsb_uops) Number of Uops delivered into Instruction Decode Queue (IDQ) when MS_Busy, initiated by Decode Stream Buffer (DSB). 

0x20: (name=ms_mite_uops) Number of Uops delivered into Instruction Decode Queue (IDQ) when MS_Busy, initiated by MITE. 

0x30: (name=ms_uops) Number of Uops were delivered into Instruction Decode Queue (IDQ) from MS, initiated by Decode Stream Buffer (DSB) or MITE. 

0x30: (name=ms_cycles) Number of cycles that Uops were delivered into Instruction Decode Queue (IDQ) when MS_Busy, initiated by Decode Stream Buffer (DSB) or MITE. 

0x04: (name=mite_cycles) Cycles MITE is active 

0x08: (name=dsb_cycles) Cycles Decode Stream Buffer (DSB) is active 

0x10: (name=ms_dsb_cycles) Cycles Decode Stream Buffer (DSB) Microcode Sequenser (MS) is active 

0x10: (name=ms_dsb_occur) Occurences of Decode Stream Buffer (DSB) Microcode Sequenser (MS) going active 

0x18: (name=all_dsb_cycles_any_uops) Cycles Decode Stream Buffer (DSB) is delivering anything 

0x18: (name=all_dsb_cycles_4_uops) Cycles Decode Stream Buffer (DSB) is delivering 4 Uops 

0x24: (name=all_mite_cycles_any_uops) Cycles MITE is delivering anything 

0x24: (name=all_mite_cycles_4_uops) Cycles MITE is delivering 4 Uops 

0x3c: (name=mite_all_uops) Number of uops delivered to Instruction Decode Queue (IDQ) from any path. 

icache

Instruction cache events

all

0x02: No unit mask 

itlb_misses

I-TLB misses

all

0x01: (name=miss_causes_a_walk) Miss in all TLB levels causes an page walk of any page size (4K/2M/4M) 

0x02: (name=walk_completed) Miss in all TLB levels causes a page walk that completes of any page size (4K/2M/4M) 

0x04: (name=walk_duration) Cycles PMH is busy with this walk. 

0x10: (name=stlb_hit) First level miss but second level hit; no page walk. 

ild_stall

Instruction decoding stalls

all

0x01: (name=lcp) Stall "occurrences" due to length changing prefixes (LCP). 

0x04: (name=iq_full) Stall cycles when instructions cannot be written because the Instruction Queue (IQ) is full. 

br_inst_exec

Branch instructions

all

0xff: (name=all_branches) All branch instructions executed. 

0x41: (name=nontaken_conditional) All macro conditional nontaken branch instructions. 

0x81: (name=taken_conditional) All macro conditional taken branch instructions. 

0x82: (name=taken_direct_jump) All macro unconditional taken branch instructions, excluding calls and indirects. 

0x84: (name=taken_indirect_jump_non_call_ret) All taken indirect branches that are not calls nor returns. 

0x88: (name=taken_indirect_near_return) All taken indirect branches that have a return mnemonic. 

0x90: (name=taken_direct_near_call) All taken non-indirect calls. 

0xa0: (name=taken_indirect_near_call) All taken indirect calls, including both register and memory indirect. 

0xc1: (name=all_conditional) All macro conditional branch instructions. 

0xc2: (name=all_direct_jmp) All macro unconditional branch instructions, excluding calls and indirects 

0xc4: (name=all_indirect_jump_non_call_ret) All indirect branches that are not calls nor returns. 

0xc8: (name=all_indirect_near_return) All indirect return branches. 

0xd0: (name=all_direct_near_call) All non-indirect calls executed. 

br_misp_exec

Mispredicted branch instructions

all

0xff: (name=all_branches) All mispredicted branch instructions executed. 

0x41: (name=nontaken_conditional) All nontaken mispredicted macro conditional branch instructions. 

0x81: (name=taken_conditional) All taken mispredicted macro conditional branch instructions. 

0x84: (name=taken_indirect_jump_non_call_ret) All taken mispredicted indirect branches that are not calls nor returns. 

0x88: (name=taken_return_near) All taken mispredicted indirect branches that have a return mnemonic. 

0x90: (name=taken_direct_near_call) All taken mispredicted non-indirect calls. 

0xa0: (name=taken_indirect_near_call) All taken mispredicted indirect calls, including both register and memory indirect. 

0xc1: (name=all_conditional) All mispredicted macro conditional branch instructions. 

0xc4: (name=all_indirect_jump_non_call_ret) All mispredicted indirect branches that are not calls nor returns. 

0xd0: (name=all_direct_near_call) All mispredicted non-indirect calls 

idq_uops_not_delivered

uops not delivered to IDQ.

all

0x01: (name=core) Count number of non-delivered uops to Resource Allocation Table (RAT). 

0x01: (name=cycles_0_uops_deliv.core) Counts the cycles no uops were delivered 

0x01: (name=cycles_le_1_uop_deliv.core) Counts the cycles less than 1 uops were delivered 

0x01: (name=cycles_le_2_uop_deliv.core) Counts the cycles less than 2 uops were delivered 

0x01: (name=cycles_le_3_uop_deliv.core) Counts the cycles less than 3 uops were delivered 

0x01: (name=cycles_ge_1_uop_deliv.core) Cycles when 1 or more uops were delivered to the by the front end. 

0x01: (name=cycles_fe_was_ok) Counts cycles FE delivered 4 uops or Resource Allocation Table (RAT) was stalling FE. 

uops_dispatched_port

Count on which ports uops are dispatched.

all

0x01: (name=port_0) Cycles which a Uop is dispatched on port 0 

0x02: (name=port_1) Cycles which a Uop is dispatched on port 1 

0x04: (name=port_2_ld) Cycles which a load Uop is dispatched on port 2 

0x08: (name=port_2_sta) Cycles which a STA Uop is dispatched on port 2 

0x10: (name=port_3_ld) Cycles which a load Uop is dispatched on port 3 

0x20: (name=port_3_sta) Cycles which a STA Uop is dispatched on port 3 

0x40: (name=port_4) Cycles which a Uop is dispatched on port 4 

0x80: (name=port_5) Cycles which a Uop is dispatched on port 5 

0x0c: (name=port_2) Uops disptached to port 2, loads and stores (speculative and retired) 

0x30: (name=port_3) Uops disptached to port 3, loads and stores (speculative and retired) 

0x0c: (name=port_2_core) Uops disptached to port 2, loads and stores per core (speculative and retired) 

0x30: (name=port_3_core) Uops disptached to port 3, loads and stores per core (speculative and retired) 

resource_stalls

Core resource stalls

all

0x01: (name=any) Cycles Allocation is stalled due to Resource Related reason. 

0x02: (name=lb) Cycles Allocator is stalled due to Load Buffer full 

0x04: (name=rs) Stall due to no eligible Reservation Station (RS) entry available. 

0x08: (name=sb) Cycles Allocator is stalled due to Store Buffer full (not including draining from synch). 

0x10: (name=rob) ROB full cycles. 

0x0e: (name=mem_rs) Resource stalls due to LB, SB or Reservation Station (RS) being completely in use 

0xf0: (name=ooo_rsrc) Resource stalls due to Rob being full, FCSW, MXCSR and OTHER 

0x0a: (name=lb_sb) Resource stalls due to load or store buffers 

dsb2mite_switches

Number of Decode Stream Buffer (DSB) to MITE switches

all

0x01: (name=count) Number of Decode Stream Buffer (DSB) to MITE switches 

0x02: (name=penalty_cycles) Decode Stream Buffer (DSB)-to-MITE switch true penalty cycles. 

dsb_fill

DSB fill events

all

0x02: (name=other_cancel) Count number of times a valid DSB fill has been actually cancelled for any reason. 

0x08: (name=exceed_dsb_lines) Decode Stream Buffer (DSB) Fill encountered > 3 Decode Stream Buffer (DSB) lines. 

0x0a: (name=all_cancel) Count number of times a valid Decode Stream Buffer (DSB) fill has been actually cancelled for any reason. 

itlb

ITLB events

all

0x01: No unit mask 

offcore_requests

Requests sent outside the core

all

0x01: (name=demand_data_rd) Demand Data Read requests sent to uncore 

0x02: (name=demand_code_rd) Offcore Code read requests. Includes Cacheable and Un-cacheables. 

0x04: (name=demand_rfo) Offcore Demand RFOs. Includes regular RFO, Locks, ItoM. 

0x08: (name=all_data_rd) Offcore Demand and prefetch data reads returned to the core. 

uops_dispatched

uops dispatched

all

0x01: (name=thread) Counts total number of uops to be dispatched per-thread each cycle. 

0x01: (name=stall_cycles) Counts number of cycles no uops were dispatced to be executed on this thread. 

0x02: (name=core) Counts total number of uops dispatched from any thread 

offcore_requests_buffer

Offcore requests buffer events

all

0x01: No unit mask 

agu_bypass_cancel

AGU bypass cancel

all

0x01: No unit mask 

tlb_flush

TLB flushes

all

0x01: (name=dtlb_thread) Count number of DTLB flushes of thread-specific entries. 

0x20: (name=stlb_any) Count number of any STLB flushes 

l1d_blocks

L1D cache blocking events

all

0x01: (name=ld_bank_conflict) Any dispatched loads cancelled due to DCU bank conflict 

0x01: No unit mask 

other_assists

Instructions that needed an assist

all

0x02: (name=itlb_miss_retired) Instructions that experienced an ITLB miss. Non Pebs 

0x10: (name=avx_to_sse) Number of transitions from AVX-256 to legacy SSE when penalty applicable Non Pebs 

0x20: (name=sse_to_avx) Number of transitions from legacy SSE to AVX-256 when penalty applicable Non Pebs 

uops_retired

uops that actually retired.

all

0x01: (name=all) All uops that actually retired. 

0x02: (name=retire_slots) number of retirement slots used non PEBS 

0x01: (name=stall_cycles) Cycles no executable uops retired 

0x01: (name=total_cycles) Number of cycles using always true condition applied to non PEBS uops retired event. 

machine_clears

Number of Machine Clears detected.

all

0x02: (name=memory_ordering) Number of Memory Ordering Machine Clears detected. 

0x04: (name=smc) Number of Self-modifying code (SMC) Machine Clears detected. 

0x20: (name=maskmov) Number of AVX masked mov Machine Clears detected. 

br_inst_retired

Counts branch instructions retired

all

0x01: (name=conditional) Counts all taken and not taken macro conditional branch instructions. 

0x02: (name=near_call) Counts all macro direct and indirect near calls. non PEBS 

0x08: (name=near_return) This event counts the number of near ret instructions retired. 

0x10: (name=not_taken) Counts all not taken macro branch instructions retired. 

0x20: (name=near_taken) Counts the number of near branch taken instructions retired. 

0x40: (name=far_branch) Counts the number of far branch instructions retired. 

0x04: (name=all_branches_ps) Counts all taken and not taken macro branches including far branches.(Precise Event) 

0x02: (name=near_call_r3) Ring123 only near calls (non precise) 

0x02: (name=near_call_r3_ps) Ring123 only near calls (precise event) 

br_misp_retired

Counts mispredicted branch instructions

all

0x01: (name=conditional) All mispredicted macro conditional branch instructions. 

0x02: (name=near_call) All macro direct and indirect near calls 

0x10: (name=not_taken) number of branch instructions retired that were mispredicted and not-taken. 

0x20: (name=taken) number of branch instructions retired that were mispredicted and taken. 

0x04: (name=all_branches_ps) all macro branches (Precise Event) 

fp_assist

Counts floating point assists

all

0x1e: (name=any) Counts any FP_ASSIST umask was incrementing. 

0x02: (name=x87_output) output - Numeric Overflow, Numeric Underflow, Inexact Result 

0x04: (name=x87_input) input - Invalid Operation, Denormal Operand, SNaN Operand 

0x08: (name=simd_output) Any output SSE* FP Assist - Numeric Overflow, Numeric Underflow. 

0x02: No unit mask 

mem_uops_retired

Count uops with memory accessed retired

all

0x11: (name=stlb_miss_loads) STLB misses dues to retired loads 

0x12: (name=stlb_miss_stores) STLB misses dues to retired stores 

0x21: (name=lock_loads) Locked retired loads 

0x41: (name=split_loads) Retired loads causing cacheline splits 

0x42: (name=split_stores) Retired stores causing cacheline splits 

0x81: (name=all_loads) Any retired loads 

0x82: (name=all_stores) Any retired stores 

mem_load_uops_retired

Memory load uops.

all

0x01: (name=l1_hit) Load hit in nearest-level (L1D) cache 

0x02: (name=l2_hit) Load hit in mid-level (L2) cache 

0x04: (name=llc_hit) Load hit in last-level (L3) cache with no snoop needed 

0x40: (name=hit_lfb) A load missed L1D but hit the Fill Buffer 

mem_load_uops_llc_hit_retired

Memory load uops with LLC (Last level cache) hit

all

0x01: (name=xsnp_miss) Load LLC Hit and a cross-core Snoop missed in on-pkg core cache 

0x02: (name=xsnp_hit) Load LLC Hit and a cross-core Snoop hits in on-pkg core cache 

0x04: (name=xsnp_hitm) Load had HitM Response from a core on same socket (shared LLC). 

0x08: (name=xsnp_none) Load hit in last-level (L3) cache with no snoop needed. 

mem_load_uops_misc_retired

Memory load uops retired

all

0x02: No unit mask 

l2_trans

L2 cache accesses

all

0x80: (name=all_requests) Transactions accessing L2 pipe 

0x01: (name=demand_data_rd) Demand Data Read requests that access L2 cache, includes L1D prefetches. 

0x02: (name=rfo) RFO requests that access L2 cache 

0x04: (name=code_rd) L2 cache accesses when fetching instructions including L1D code prefetches 

0x08: (name=all_pf) L2 or LLC HW prefetches that access L2 cache 

0x10: (name=l1d_wb) L1D writebacks that access L2 cache 

0x20: (name=l2_fill) L2 fill requests that access L2 cache 

0x40: (name=l2_wb) L2 writebacks that access L2 cache 

l2_lines_in

L2 cache lines in

all

0x07: (name=all) L2 cache lines filling L2 

0x01: (name=i) L2 cache lines in I state filling L2 

0x02: (name=s) L2 cache lines in S state filling L2 

0x04: (name=e) L2 cache lines in E state filling L2 

l2_lines_out

L2 cache lines out

all

0x01: (name=demand_clean) Clean line evicted by a demand 

0x02: (name=demand_dirty) Dirty line evicted by a demand 

0x04: (name=pf_clean) Clean line evicted by an L2 Prefetch 

0x08: (name=pf_dirty) Dirty line evicted by an L2 Prefetch 

0x0a: (name=dirty_all) Any Dirty line evicted 

sq_misc

Store queue misc events

all

0x10: No unit mask