From e2ce7103aa9ff239d0ffcc71b4bd9c33dbf65284 Mon Sep 17 00:00:00 2001
From: Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
Date: Mon, 7 Dec 2015 14:05:49 +0100
Subject: [PATCH] disable the nagle algorithm to speed up write operations to
 the tcp connections (and dramatically improving write performance) fixes
 issue 50

---
 src/includes.h    |  1 +
 src/tcpresolver.h | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/includes.h b/src/includes.h
index 005239b..6768f00 100644
--- a/src/includes.h
+++ b/src/includes.h
@@ -25,6 +25,7 @@
 #include <sys/socket.h>
 #include <netdb.h>
 #include <unistd.h>
+#include <netinet/tcp.h>
 #include <functional>
 
 // forward declarations
diff --git a/src/tcpresolver.h b/src/tcpresolver.h
index 19c1938..e16d626 100644
--- a/src/tcpresolver.h
+++ b/src/tcpresolver.h
@@ -110,7 +110,17 @@ private:
             }
             
             // connection succeeded, mark socket as non-blocking
-            if (_socket >= 0) fcntl(_socket, F_SETFL, O_NONBLOCK);
+            if (_socket >= 0) 
+            {
+                // turn socket into a non-blocking socket
+                fcntl(_socket, F_SETFL, O_NONBLOCK);
+
+                // we want to enable "nodelay" on sockets (otherwise all send operations are s-l-o-w
+                int optval = 1;
+                
+                // set the option
+                setsockopt(_socket, IPPROTO_TCP, TCP_NODELAY, &optval, sizeof(int));
+            }
         }
         catch (const std::runtime_error &error)
         {