https://nalar.dev/tags/napi/ Recent content in NAPI on Nalar Hugo en-us Sat, 03 Oct 2026 00:00:00 +0000 https://nalar.dev/so-busy-poll-trades-cpu-time-for-earlier-socket-receive-processing/ Sat, 03 Oct 2026 00:00:00 +0000 https://nalar.dev/so-busy-poll-trades-cpu-time-for-earlier-socket-receive-processing/ <p>A blocking receive on Linux normally sleeps when no data is ready and resumes after the networking path makes data available. With <code>SO_BUSY_POLL</code>, the receive path may instead spend a bounded interval actively polling the relevant NAPI context for incoming packets. That interval exchanges CPU time for a chance to process an arrival before the ordinary interrupt-driven path wakes the task.</p> <p>The option does not turn a socket into a permanently polling endpoint. It supplies a busy-poll budget in microseconds, and the mechanism depends on receive history and network-device support.</p>