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Ryan HuberandClaude Opus 5.5
81f991f1fd
tun.WriteBatch writes up to 64 packets per sendmsg_x on the utun control socket, and Passthrough.Flush hands its lane to it whole through the new tio.BatchWriter (Caleb Jasik's #1896). Only the darwin tun implements BatchWriter, so every other platform keeps one Write per packet. tunQueue.Read drains every packet already queued on the utun, up to 64, so a burst reaches the send batch together. xnu lets only one packet wait on a utun control socket by default, so each read found one packet. The tun now raises UTUN_OPT_MAX_PENDING_PACKETS to 64, growing SO_RCVBUF to hold that many packets first; on failure it logs and keeps xnu's default. Tests: #1896's WriteBatch tests over sendmsg_x and the writev fallback, the drain tests, the pending-packet setsockopts, and #1906's framing and zero-alloc Read/Write tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>