This is a list of Alpha EV6 CPU's performance counter event types. Please see alpha architecture reference
| Name | Description | Counters usable | Unit mask options |
| CYCLES | Total cycles | all | |
| RETIRED | Retired instructions | 1 | |
| COND_BRANCHES | Retired conditional branches | 1 | |
| BRANCH_MISPREDICTS | Retired branch mispredicts | 1 | |
| DTB_MISS | Retired DTB single misses * 2 | 1 | |
| DTB_DD_MISS | Retired DTB double double misses | 1 | |
| ITB_MISS | Retired ITB misses | 1 | |
| UNALIGNED_TRAP | Retired unaligned traps | 1 | |
| REPLAY_TRAP | Replay traps | 1 |
Rules of Optimization: Rule 1: Don't do it. Rule 2 (for experts only): Don't do it yet.- M.A. Jackson