diff --git a/hptp-send/src/main.rs b/hptp-send/src/main.rs
index 2bd3c55..8264977 100644
--- a/hptp-send/src/main.rs
+++ b/hptp-send/src/main.rs
@@ -86,8 +86,6 @@ struct UnAcked {
     nacks: usize,
 }
 
-const IN_FLIGHT: usize = 30;
-
 impl UnAcked {
     fn nack(self) -> Self {
         Self {
@@ -204,6 +202,10 @@ where
         self.unacked_segs = new_unacked_segs;
         self.next_retrans_idx = 0;
     }
+
+    fn is_file_completed(&self) -> bool {
+        self.eof && self.unacked_segs.is_empty()
+    }
 }
 
 async fn upload<IN>(log: &mut Logger, peer: &mut UpPeer, inp: &mut IN) -> Result<(), Error>
@@ -230,7 +232,7 @@ where
 
     let mut src = SegmentSource::new(inp);
 
-    const DELAY_MS: u64 = (1000 / IN_FLIGHT) as u64;
+    let in_flight = 66;
     let mut deadline = Instant::now();
     let mut to_send = vec![];
 
@@ -252,7 +254,8 @@ where
 
         let act = match evt {
             Evt::Timer => {
-                deadline += Duration::from_millis(DELAY_MS);
+                let delay_ms = (1000 / in_flight) as u64;
+                deadline += Duration::from_millis(delay_ms);
                 match src.get_segment().await {
                     Some((seg_idx, payload)) => {
                         log.send_data(seg_idx as usize, payload.len()).await;
@@ -267,9 +270,13 @@ where
             }
 
             Evt::Recv(DownMsg::Ack { idxs }) => {
-                log.debug_msg(format!("got acks: {:?}", idxs)).await;
+                log.debug_msg(format!("got {} acks", idxs.len())).await;
                 src.ack(&idxs);
-                Action::Continue
+                if src.is_file_completed() {
+                    Action::Quit
+                } else {
+                    Action::Continue
+                }
             }
         };