41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
# TC-NET-604 诊断：芯片 TX 分包粒度探测（= SET_TCP_MSS 有效值）
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# 向回显端发送 N 字节，紧循环小包 recv + 计时，输出到达分块分布。
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# 芯片 TX 包 = MSS 大小 → 到达粒度 ≈ 芯片发包大小（同交换机微秒级间隔，按 1ms 窗口聚合）。
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import socket, sys, time
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ip, port = sys.argv[1] if len(sys.argv) > 1 else "192.168.1.100", 8080
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size = int(sys.argv[2]) if len(sys.argv) > 2 else 4096
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(30)
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s.connect((ip, int(port)))
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payload = bytes(i & 0xFF for i in range(size))
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t0 = time.perf_counter()
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s.sendall(payload)
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# 紧循环非阻塞式读取（recv 4096 上限，记录每次 recv 的字节数与相对时刻）
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s.setblocking(False)
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chunks = []
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got = 0
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deadline = time.time() + 10.0
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while got < size and time.time() < deadline:
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try:
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b = s.recv(4096)
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if b:
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chunks.append((round((time.perf_counter() - t0) * 1000, 1), len(b)))
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got += len(b)
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except BlockingIOError:
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time.sleep(0.001)
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s.close()
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print(f"sent={size} got={got} in {round((time.perf_counter()-t0)*1000,1)}ms")
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if chunks:
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from collections import Counter
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c = Counter(n for _, n in chunks)
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print("arrival chunks (ms, bytes):")
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for t, n in chunks:
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print(f" +{t:7.1f}ms {n:5d}B")
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print("size histogram:", dict(sorted(c.items())))
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else:
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print("NO DATA (stall?)")
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