RISC-V Design · All levels
Pipeline Performance and CPI Decomposition: Reports and Metrics
Reports and Metrics for Pipeline Performance and CPI Decomposition.
Reports and metrics
Reports and Metrics for Pipeline Performance and CPI Decomposition is anchored on Measured CPI broken into ideal base CPI, structural stalls, data stalls, control stalls, and memory wait contributions.. Convert observations into mechanism-backed decisions with explicit ownership.
Before/after trend
diagram
BEFORE / AFTER TREND - Pipeline Performance and CPI Decomposition
Measured CPI broken into ideal base CPI, structural stalls, data stalls, control stalls, and memory wait contributions.
^
| o target band
| o after fix + reruns
| o
| o baseline (failing)
+--------------------------------------------------> iteration
capture issue isolate mechanism close + monitor
Use this view to confirm the gain is causal and stable across seeds.Root-cause tree
diagram
ROOT CAUSE TREE - Pipeline Performance and CPI Decomposition
Measured CPI broken into ideal base CPI, structural stalls, data stalls, control stalls, and memory wait contributions. regressed
|
reproducible on fixed seed?
/ \
no yes
| |
env/tool drift first failing domain?
/ | \
decode execute memory/MMU
| | |
control map bypass/FU TLB/walk/perm
|
privilege/CSR side effects checked?
Stop at first confirmed mechanism, then assign explicit owner + fix proof.Track Measured CPI broken into ideal base CPI, structural stalls, data stalls, control stalls, and memory wait contributions. on representative workloads, not just microbenchmarks.
Include build/runtime/privilege metadata in report headers.
Pair performance movement with correctness and reliability checks.
Report tail stability, not only mean uplift.