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analysis: split TCP retransmissions into forward and return, and show both on the line cards

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tcp.retrans.up counts retransmitted segments sent by the dialing side, tcp.retrans.down those sent by the listening side. The cards show RTT as a round trip (⇄) with forward (→) and return (←) rows for QUIC loss and TCP retransmission.
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justme committed 2026-10-21 16:26:34 +08:00
1 parent 48ffa56285
commit 9f5a6cf77a
9 files changed
+104 -37
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backend/tests/MoShiro.Backend.Analysis.Tests/OpTests.cs
+17
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@@ -260,6 +260,23 @@ public sealed class OpTests
Assert.Equal(300UL, retrans.Denominator);
}
[Fact]
public void Retrans_ForwardAndReturnAreSplitBySide()
{
long ts = ChunkFactory.DialerUs(0);
var builder = new StreamBuilder(Kinds.TcpEcho.FindStream("tcp_info")!);
builder.Add(ts, 0, 40_000, 0, 10, 10, 1000, 0, 1);
builder.Add(ts, 1, 40_000, 0, 10, 100, 2000, 0, 1);
builder.Add(ts + 1_000_000, 0, 40_000, 0, 10, 11, 1100, 0, 1);
builder.Add(ts + 1_000_000, 1, 40_000, 0, 10, 102, 2200, 0, 1);
RawChunk chunk = ChunkFactory.Echo(s_agent, "tcp_echo", T0, 10, 100,
_ => new EchoPacket(false, false, 20_000, 20_000), extraStreams: [builder.Build()]);
var forward = (RatioAcc)EvaluateOneBucket(chunk, "tcp.retrans.up").Items["tcp.retrans.up"];
var back = (RatioAcc)EvaluateOneBucket(chunk, "tcp.retrans.down").Items["tcp.retrans.down"];
Assert.Equal((1UL, 100UL), (forward.Numerator, forward.Denominator));
Assert.Equal((2UL, 200UL), (back.Numerator, back.Denominator));
}
[Fact]
public void Connect_Outcomes_AreCountedByClass()
{