Use the -W <windowsize> argument in startup scripts, with a default of 64kB

--HG--
extra : convert_revision : bbc5073267b8af362e59a46bc8328c03cfd4bd4c

debian/dropbear.init

@@ -48,7 +48,7 @@ case "$1" in
 	sleep 1
 	start-stop-daemon --start --quiet --pidfile /var/run/"$NAME".pid \
 	  --exec "$DAEMON" -- -d "$DROPBEAR_DSSKEY" -r "$DROPBEAR_RSAKEY" \
-	    -p "$DROPBEAR_PORT" $DROPBEAR_EXTRA_ARGS
+	    -p "$DROPBEAR_PORT" -W "$DROPBEAR_RECEIVE_WINDOW" $DROPBEAR_EXTRA_ARGS
 	echo "$NAME."
 	;;
   *)

debian/dropbear.postinst

@@ -54,6 +54,10 @@ DROPBEAR_BANNER=""
 
 # DSS hostkey file (default: /etc/dropbear/dropbear_dss_host_key)
 #DROPBEAR_DSSKEY="/etc/dropbear/dropbear_dss_host_key"
+
+# Receive window size - this is a tradeoff between memory and
+# network performance
+DROPBEAR_RECEIVE_WINDOW=65536
 EOT
 fi