Debug some issues with the state machine that tracks idle connections in link.go

src/yggdrasil/switch.go

@@ -780,6 +780,7 @@ func (t *switchTable) doWorker() {
 	t.queues.bufs = make(map[string]switch_buffer) // Packets per PacketStreamID (string)
 	idle := make(map[switchPort]struct{})          // this is to deduplicate things
 	for {
+		t.core.log.Debugf("Switch state: idle = %d, buffers = %d", len(idle), len(t.queues.bufs))
 		select {
 		case bytes := <-t.packetIn:
 			// Try to send it somewhere (or drop it if it's corrupt or at a dead end)