Open Source Linux
May 16, 2024 · Fundamentals
Why Does TCP Send‑Q Exceed SO_SNDBUF? Inside Linux Kernel Buffer Mechanics
A Linux client sets SO_SNDBUF to 4096 bytes and sends 1 KB packets while the server never receives them, yet the TCP Send‑Q grows to 14480 bytes, prompting an in‑depth analysis of kernel buffer accounting, double‑sized send buffers, and tcp_sendmsg behavior.
Linux kernelNetworkingSO_SNDBUF
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