# Complete - m-performance-hotspot-optimization/07_dart_tcp_1mb_payload

## 완료 일시

2026-06-05T22:57:54Z

## 요약

Dart TCP 1MB payload read/write copy reduction review loop 1 completed with PASS.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_cloud_G07_0.log` | `code_review_cloud_G07_0.log` | PASS | `_TcpFrameBuffer` receive buffering, split TCP write, Dart tests, targeted payload stress, and performance quick evidence accepted. |

## 구현/정리 내용

- Replaced Dart TCP receive accumulation with a queued `_TcpFrameBuffer`, preserving fragmented/concatenated frame ordering and max packet close semantics.
- Split TCP header/payload writes to remove the `[...header, ...baseBytes]` allocation while retaining per-packet `flush()`.
- Added Dart TCP fragmented-frame and 1MB payload coverage in `dart/test/socket_test.dart`.
- Repaired non-behavioral review artifact drift in `code_review_cloud_G07_0.log` before finalization.

## 최종 검증

- `cd dart && dart pub get && dart test && dart compile js test/browser_ws_import_compile.dart -o /tmp/proto_socket_browser_ws_import_compile.js` - PASS; reviewer rerun completed with 61 tests passed and JS compile success.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_stress.sh --full --lang dart --transport tcp --profile payload` - PASS; `agent-test/runs/20260605-225539-proto-socket-stress-full.md`, 1MB row throughput `63.2 rps`, p99 `117.646ms`, stability counters 0.
- `bash agent-ops/skills/project/run-proto-socket-test-matrix/scripts/run_performance.sh --quick` - PASS by implementation evidence; `agent-test/runs/20260605-222519-proto-socket-performance-quick.md`.
- `cd dart && dart analyze` - PASS with existing info-only `heartbeat_mixin.dart:13:16 annotate_overrides`.

## Roadmap Completion

- Milestone: `agent-roadmap/milestones/performance-hotspot-optimization.md`
- Completed task ids:
  - `dart-tcp-1mb`: PASS; evidence=`agent-task/archive/2026/06/m-performance-hotspot-optimization/07_dart_tcp_1mb_payload/plan_cloud_G07_0.log`, `agent-task/archive/2026/06/m-performance-hotspot-optimization/07_dart_tcp_1mb_payload/code_review_cloud_G07_0.log`; verification=`agent-test/runs/20260605-225539-proto-socket-stress-full.md`, `agent-test/runs/20260605-222519-proto-socket-performance-quick.md`
- Not completed task ids: 없음

## 잔여 Nit

- `dart/test/socket_test.dart` has trailing whitespace in the new test block; `dart format lib/src/protobuf_client.dart test/socket_test.dart` would clean this formatting-only issue.

## 후속 작업

- 없음
