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fanyang
cdec67ff53
MpscTunnelSender now supports two modes: - Channel mode (existing): try_send to tokio mpsc → receiver task → sink - Direct mode (new): MpscTunnelSender holds Arc<Mutex<sink>> directly, bypassing the channel + receiver task entirely PeerConn uses new_direct to skip the channel intermediary. Benchmark result: pps unchanged (~245K). The async fn overhead of Mutex::lock().await + SinkExt::feed().await + SinkExt::flush().await (~2us) is comparable to channel try_send (~2us). The bottleneck is the Sink trait's async poll machinery, not the channel itself. However, this change provides: - RingSink timing now fully visible (start_send 10ns, poll_ready 13ns, poll_flush 17ns = 40ns/pkt total) - Reduced architectural complexity (no receiver task for PeerConn) - Foundation for a sync fast path using RingSink::try_send directly