for smallish packets, queue the size and data together

git-svn-id: https://xpra.org/svn/Xpra/trunk@246 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/protocol.py

@@ -152,9 +152,14 @@ def _flush_one_packet_into_buffer(self):
         if packet is not None:
             log("writing %s", dump_packet(packet), type="raw.write")
             data = bencode(packet)
-            if self._send_size:
-                self._queue_write("PS%014d" % len(data))
-            self._queue_write(data, True)
+            l = len(data)
+            if l<=1024:
+                #send size and data together (low copy overhead):
+                self._queue_write("PS%014d%s" % (l, data), True)
+            else:
+                if self._send_size:
+                    self._queue_write("PS%014d" % l)
+                self._queue_write(data, True)
 
     def _write_thread_loop(self):
         try: