Feat/benchmark#84
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Add benchmarking infrastructure to measure performance of identified hot paths in the packet processing pipeline. Benchmarks use rdtsc for cycle-accurate timing and avoid ASAN to get accurate measurements. Benchmarks included: - bench-decode: Header parsing overhead (decode vs re-parse) - bench-malloc: Per-packet allocation cost (malloc vs ring buffer) - bench-rotation: Interval table rotation (copy vs swap) - bench-sort: Flow sorting (full sort vs partial top-N) Initial results show significant optimization opportunities: - Ring buffer: 72% fewer cycles than malloc/free - Partial sort: 86% fewer cycles than HASH_SRT - Swap rotation: 37% fewer cycles than copy Run with: make -C deps/toptalk bench 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add bench_regression.c with automated performance threshold checks for critical operations: - Header decoding: <500 cycles - Ring buffer allocation: <100 cycles - Top-N flow selection: <5000 cycles (100 flows) Run with: make -C deps/toptalk bench-test This ensures performance improvements are not regressed by future changes. Thresholds are set conservatively high to avoid false failures on varying hardware. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add Test 4 to bench_regression.c measuring the actual per-packet hot path through update_stats_tables(). Tests two scenarios: - Single flow: ~57 cycles/op (hash hit case) - 10K flows: ~200 cycles/op (hash table stress) Adds benchmark hooks to intervals.h/c: - tt_bench_init(): Initialize data structures without pcap - tt_bench_cleanup(): Clean up after benchmarking - tt_bench_update_stats(): Process decoded packet through stats path Results show the optimizations achieved the 200 cycle/packet target, enabling ~15M pps theoretical throughput on a 3 GHz CPU. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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