Link test: download series (bulk sampled, warm bursts, paced) and burst-vs-idle; car results
Orin -> tablet over NCM: paced streams up to 4 MB/s are clean; unpaced bursts and bulk hit multi-second holds that inflate the RTO to 10-16 s. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz
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@@ -145,6 +145,219 @@ class LinkTest extends ChangeNotifier {
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return {'bytes': bytes, 'secs': (t * 1000).round() / 1000, 'mb_s': (bytes / t / 1e4).round() / 100};
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}
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/// Orin → tablet only: sustained bulk sampled every 250 ms, TTS-like bursts on a
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/// warm connection, and camera-like paced streams.
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Future<void> runDownload(String host, String label, {int repeats = 5, int bulkSecs = 10, int pacedSecs = 10}) async {
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if (running) return;
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running = true;
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lines.clear();
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final id = '$label-${DateTime.now().toUtc().toIso8601String().substring(0, 19)}';
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_line('download series $id → $host');
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try {
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await usb.bindFor(Uri(scheme: 'ws', host: host));
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await _report(host, {'id': id, 'kind': 'start', 'label': label, 'series': 'download'});
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for (var i = 0; i < repeats; i++) {
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_status('bulk ${i + 1}/$repeats, $bulkSecs s');
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final r = await tcpBulkSampled(host, id, bulkSecs);
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_line('bulk ${i + 1}: ${r['mb_s']} MB/s, 250 ms windows min ${r['win_min_mb_s']} p10 ${r['win_p10_mb_s']} max ${r['win_max_mb_s']}, longest stall ${r['max_gap_ms']} ms');
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await _report(host, {'id': id, 'kind': 'dl_bulk', 'n': i, ...r});
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}
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_status('bursts');
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final b = await tcpBursts(host, id, sizes: const [65536, 262144, 1048576, 4194304], repeats: repeats);
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for (final e in (b['sizes'] as List)) {
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_line('burst ${e['bytes'] ~/ 1024} KB: p50 ${e['p50_ms']} ms, max ${e['max_ms']} ms (${e['mb_s_p50']} MB/s at p50)');
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}
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await _report(host, {'id': id, 'kind': 'dl_bursts', ...b});
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for (final rate in const [500000, 1000000, 2000000, 4000000]) {
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_status('paced ${rate / 1e6} MB/s, $pacedSecs s');
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final r = await tcpPaced(host, id, rate, pacedSecs);
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_line('paced ${rate / 1e6} MB/s: got ${r['mb_s']} MB/s, ${r['frames']}/${r['expected']} frames, queueing p50 ${r['q_p50_ms']} p99 ${r['q_p99_ms']} max ${r['q_max_ms']} ms, >100 ms ${r['late_100']}, >500 ms ${r['late_500']}');
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await _report(host, {'id': id, 'kind': 'dl_paced', ...r});
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}
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await _report(host, {'id': id, 'kind': 'end'});
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_status('done');
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} catch (e) {
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_line('error: $e');
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_status('failed');
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try {
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await _report(host, {'id': id, 'kind': 'error', 'error': '$e'});
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} catch (_) {}
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} finally {
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running = false;
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notifyListeners();
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}
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}
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/// Burst latency against the idle gap before each burst, with and without keepalive traffic.
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Future<void> runBurstIdle(String host, String label) async {
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if (running) return;
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running = true;
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lines.clear();
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final id = '$label-${DateTime.now().toUtc().toIso8601String().substring(0, 19)}';
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_line('burst/idle series $id → $host');
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try {
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await usb.bindFor(Uri(scheme: 'ws', host: host));
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await _report(host, {'id': id, 'kind': 'start', 'label': label, 'series': 'burst-idle'});
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for (final (idleMs, ka) in const [(0, 0), (50, 0), (200, 0), (1000, 0), (1000, 50), (0, 0)]) {
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_status('256 KB bursts, idle $idleMs ms, keepalive $ka/s');
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final r = await tcpBursts(host, id, sizes: const [262144], repeats: 8, idle: Duration(milliseconds: idleMs), keepalivePps: ka);
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final e = (r['sizes'] as List).first;
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_line('idle $idleMs ms ka $ka/s: p50 ${e['p50_ms']} max ${e['max_ms']} ms ${e['ms']}');
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await _report(host, {'id': id, 'kind': 'dl_bursts', ...r});
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}
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await _report(host, {'id': id, 'kind': 'end'});
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_status('done');
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} catch (e) {
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_line('error: $e');
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_status('failed');
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try {
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await _report(host, {'id': id, 'kind': 'error', 'error': '$e'});
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} catch (_) {}
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} finally {
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running = false;
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notifyListeners();
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}
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}
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static Future<Map<String, dynamic>> tcpBulkSampled(String host, String id, int secs) async {
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final s = await Socket.connect(host, _down, timeout: const Duration(seconds: 5));
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s.write('$id $secs\n');
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final clock = Stopwatch()..start();
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final windows = <int, int>{};
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var bytes = 0, maxGap = 0;
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int? first, last;
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await s.timeout(Duration(seconds: secs + 60)).forEach((b) {
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final now = clock.elapsedMicroseconds;
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first ??= now;
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if (last != null) maxGap = max(maxGap, now - last!);
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last = now;
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bytes += b.length;
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windows.update((now - first!) ~/ 250000, (v) => v + b.length, ifAbsent: () => b.length);
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});
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s.destroy();
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final t = ((last ?? 0) - (first ?? 0)) / 1e6;
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final n = windows.isEmpty ? 0 : windows.keys.reduce(max); // drop the last, partial window
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final rates = [for (var i = 0; i < n; i++) (windows[i] ?? 0) * 4 / 1e6]..sort();
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double r2(num v) => (v * 100).round() / 100;
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return {
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'bytes': bytes,
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'secs': r2(t),
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'mb_s': t > 0 ? r2(bytes / t / 1e6) : 0,
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'win_min_mb_s': rates.isEmpty ? null : r2(rates.first),
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'win_p10_mb_s': rates.isEmpty ? null : r2(rates[rates.length ~/ 10]),
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'win_p50_mb_s': rates.isEmpty ? null : r2(rates[rates.length ~/ 2]),
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'win_max_mb_s': rates.isEmpty ? null : r2(rates.last),
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'zero_windows': rates.where((r) => r == 0).length,
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'max_gap_ms': (maxGap / 100).round() / 10,
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};
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}
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/// Each burst is requested on the same connection after 1 s idle, as utterances would be.
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static Future<Map<String, dynamic>> tcpBursts(String host, String id,
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{required List<int> sizes, required int repeats, Duration idle = const Duration(seconds: 1), int keepalivePps = 0}) async {
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// Optional light UDP traffic during the idle gaps, to tell link power saving from TCP behaviour.
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RawDatagramSocket? ka;
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Timer? kaTimer;
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if (keepalivePps > 0) {
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ka = await RawDatagramSocket.bind(InternetAddress.anyIPv4, 0);
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final addr = InternetAddress(host);
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kaTimer = Timer.periodic(Duration(microseconds: 1000000 ~/ keepalivePps), (_) => ka!.send(Uint8List(16), addr, _echo));
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}
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final s = await Socket.connect(host, _down, timeout: const Duration(seconds: 5));
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s.write('$id burst\n');
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var got = 0;
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Completer<void>? want;
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var target = 0;
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final sub = s.listen((b) {
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got += b.length;
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final w = want;
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if (w != null && !w.isCompleted && got >= target) w.complete();
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});
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final out = <Map<String, dynamic>>[];
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for (final size in sizes) {
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final ms = <double>[];
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for (var i = 0; i < repeats; i++) {
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await Future<void>.delayed(idle);
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got = 0;
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target = size;
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final w = want = Completer<void>();
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final clock = Stopwatch()..start();
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s.write('$size\n');
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await w.future.timeout(const Duration(seconds: 60));
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want = null;
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ms.add(clock.elapsedMicroseconds / 1000);
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}
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ms.sort();
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final p50 = ms[ms.length ~/ 2];
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out.add({
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'bytes': size,
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'ms': [for (final m in ms) (m * 10).round() / 10],
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'p50_ms': (p50 * 10).round() / 10,
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'max_ms': (ms.last * 10).round() / 10,
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'mb_s_p50': (size / p50 / 10).round() / 100,
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});
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}
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await sub.cancel();
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s.destroy();
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kaTimer?.cancel();
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ka?.close();
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return {'idle_ms': idle.inMilliseconds, 'keepalive_pps': keepalivePps, 'sizes': out};
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}
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/// Frames carry the Orin's send time. The clocks are not compared absolutely: queueing
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/// delay is each frame's one-way delay minus the run's smallest.
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static Future<Map<String, dynamic>> tcpPaced(String host, String id, int rate, int secs) async {
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final s = await Socket.connect(host, _down, timeout: const Duration(seconds: 5));
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s.write('$id paced $rate $secs\n');
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final header = BytesBuilder();
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var skip = 0, bytes = 0;
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final owd = <double>[];
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double? firstRx, lastRx;
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await s.timeout(Duration(seconds: secs + 60)).forEach((chunk) {
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bytes += chunk.length;
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var i = 0;
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while (i < chunk.length) {
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if (skip > 0) {
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final n = min(skip, chunk.length - i);
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skip -= n;
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i += n;
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continue;
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}
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final n = min(12 - header.length, chunk.length - i);
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header.add(Uint8List.sublistView(chunk, i, i + n));
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i += n;
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if (header.length == 12) {
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final h = ByteData.sublistView(header.takeBytes());
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final size = h.getUint32(0);
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final sentAt = h.getFloat64(4);
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skip = size - 12;
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// Arrival of the header stands for the frame; with skip pending, the rest follows.
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final now = DateTime.now().microsecondsSinceEpoch / 1e6;
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firstRx ??= now;
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lastRx = now;
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owd.add(now - sentAt);
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}
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}
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});
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s.destroy();
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final base = owd.isEmpty ? 0.0 : owd.reduce(min);
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final q = [for (final d in owd) (d - base) * 1000]..sort();
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double r1(num v) => (v * 10).round() / 10;
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final t = (lastRx ?? 0) - (firstRx ?? 0);
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return {
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'rate': rate,
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'secs': secs,
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'expected': secs * 30,
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'frames': owd.length,
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'mb_s': t > 0 ? (bytes / t / 1e4).round() / 100 : 0,
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'q_p50_ms': q.isEmpty ? null : r1(q[q.length ~/ 2]),
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'q_p99_ms': q.isEmpty ? null : r1(q[min(q.length - 1, (q.length * 0.99).floor())]),
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'q_max_ms': q.isEmpty ? null : r1(q.last),
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'late_100': q.where((v) => v > 100).length,
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'late_500': q.where((v) => v > 500).length,
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};
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}
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static Future<Map<String, dynamic>> tcpUp(String host, String id, int secs) async {
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final s = await Socket.connect(host, _up, timeout: const Duration(seconds: 5));
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final reply = utf8.decoder.bind(s).join();
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