turn on TCP_NODELAY, in both directions. This avoids latency when a request or...

turn on TCP_NODELAY, in both directions. This avoids latency when a request or response doesnt fit in one packet. ZEO is already doing its best to buffer data before calling send, so TCP_NODELAY can do little harm

src/ZEO/zrpc/client.py

@@ -262,6 +262,7 @@ class ConnectThread(threading.Thread):
                         domain, err), level=zLOG.ERROR)
                     continue
                 s.setblocking(0)
+                s.setsockopt(socket.IPPROTO_TCP, 1, 1) # TCP_NODELAY
                 self.sockets[s] = addr
                 # connect() raises Connected iff it succeeds
                 # XXX can still block for a while if addr requires DNS

src/ZEO/zrpc/server.py

@@ -41,6 +41,7 @@ class Dispatcher(asyncore.dispatcher):
             self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
         else:
             self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        self.setsockopt(socket.IPPROTO_TCP, 1, 1) # TCP_NODELAY
         self.set_reuse_addr()
         log("listening on %s" % str(self.addr))
         self.bind(self.addr)