This is a list of MIPS rm9000's performance counter event types. See RM9000x2 Family User Manual available from pmc-sierra.com
| Name | Description | Counters usable | Unit mask options |
| CYCLES | Processor clock cycles | all | |
| INSTRUCTIONS_ISSUED | Instructions issued | all | |
| FP_INSTRUCTIONS_ISSUED | Floating-point instructions issued | all | |
| INT_INSTRUCTIONS_ISSUED | Integer instructions issued | all | |
| LOAD_INSTRUCTIONS_ISSUED | Load instructions issued | all | |
| STORE_INSTRUCTIONS_ISSUED | Store instructions issued | all | |
| INSTRUCTIONS_DUAL_ISSUED | Dual-issued instruction pairs | all | |
| BRANCH_MISSPREDICTS | Branch mispredictions | all | |
| STALL_CYCLES | Stall cycles | all | |
| L2_CACHE_MISSES | L2 cache misses | all | |
| ICACHE_MISSES | Icache misses | all | |
| DCACHE_MISSES | Dcache misses | all | |
| DTLB_MISSES | Data TLB misses | all | |
| ITLB_MISSES | Instruction TLB misses | all | |
| JTLB_INSTRUCTION_MISSES | Joint TLB instruction misses | all | |
| JTLB_DATA_MISSES | Joint TLB data misses | all | |
| BRANCHES_TAKEN | Branches taken | all | |
| BRANCHES_ISSUED | Branch instructions issued | all | |
| L2_WRITEBACKS | L2 cache writebacks | all | |
| DCACHE_WRITEBACKS | Dcache writebacks | all | |
| DCACHE_MISS_STALL_CYCLES | Dcache-miss stall cycles | all | |
| CACHE_REMISSES | Cache remisses | all | |
| FP_POSSIBLE_EXCEPTION_CYCLES | Floating-point possible exception cycles | all | |
| MULTIPLIER_BUSY_SLIP_CYCLES | Slip cycles due to busy multiplier | all | |
| COP0_SLIP_CYCLES | Co-processor 0 slip cycles | all | |
| NONBLOCKING_LOAD_SLIP_CYCLES | Slip cycles due to pending non-blocking loads | all | |
| WRITE_BUFFER_FULL_STALL_CYCLES | Stall cycles due to a full write buffer | all | |
| CACHE_INSN_STALL_CYCLES | Stall cycles due to cache instructions | all | |
| NONBLOCKING_LOAD_PENDING_EXCEPTION_STALL_CYCLES | Stall cycles due to pending non-blocking loads - stall start of exception | all |
More computing sins are committed in the name of efficiency (without necessarily achieving it) than for any other single reason - including blind stupidity.- W. A. Wulf