KarpelesLab / pktkit / 24003398688

53%

Build Type

push

github

Committed by MagicalTux

Commit Message

Optimize NAT hot path: 28x throughput improvement (1.3 → 36 GB/s)

Three changes eliminate all per-packet allocation and syscall overhead:

- sync.Pool for packet buffers: removes the 1536-byte make() per packet
  that was driving ~29% of CPU into GC
- Coarse 250ms cached clock for lastActive timestamps: replaces
  time.Now() syscall on every packet with an atomic load
- Atomic helper count: skips mutex acquisition in helperOutbound/
  helperInbound/handleLocal when no helpers are registered

Result: 0 allocs/op, 40 ns/op for TCP NAT (was 1140 ns/op, 1 alloc).

Also adds benchmarks for wg and ovpn packages covering handshake,
encrypt/decrypt, replay filters, PRF, and options parsing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Coverage Stats

52 of 63 new or added lines in 2 files covered. (82.54%)

27 existing lines in 5 files now uncovered.

5847 of 13124 relevant lines covered (44.55%)

21.79 hits per line