- * and the window is shut, then we start the TCPT_PERSIST timer, and at
- * intervals send a single byte into the peers window to force him to update
- * our window information. We do this at most as often as TCPT_PERSMIN
- * time intervals, but no more frequently than the current estimate of
- * round-trip packet time. The TCPT_PERSIST timer is cleared whenever
- * we receive a window update from the peer.
+ * and the window is too small to bother sending anything, then we start
+ * the TCPT_PERSIST timer. When it expires, if the window is nonzero,
+ * we go to transmit state. Otherwise, at intervals send a single byte
+ * into the peer's window to force him to update our window information.
+ * We do this at most as often as TCPT_PERSMIN time intervals,
+ * but no more frequently than the current estimate of round-trip
+ * packet time. The TCPT_PERSIST timer is cleared whenever we receive
+ * a window update from the peer.