--- old/src/java.base/share/classes/jdk/net/ExtendedSocketOptions.java	2016-02-24 13:34:27.808280905 +0530
+++ new/src/java.base/share/classes/jdk/net/ExtendedSocketOptions.java	2016-02-24 13:34:27.688280903 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -58,4 +58,31 @@
      */
     public static final SocketOption<SocketFlow> SO_FLOW_SLA = new
         ExtSocketOption<SocketFlow>("SO_FLOW_SLA", SocketFlow.class);
+    
+    /**
+     * SO_QUICKACK.
+     *
+     * <p>
+     * The value of this socket option is a {@code Boolean} that represents
+     * whether the option is enabled or disabled. The exact semantics of this
+     * socket option are socket type and system dependent.
+     *
+     * <p>
+     * This socket option usually enable TCP_QUICKACK mode if set or disable
+     * TCP_QUICKACK mode if cleared.
+     *
+     * <p>
+     * In TCP_QUICKACK mode, acks are sent immediately, rather than delayed if
+     * needed in accordance to normal TCP operation.This flag is not permanent,
+     * it only enables a switch to or from TCP_QUICKACK mode.
+     *
+     * <p>
+     * Subsequent operation of the TCP protocol will once again enter/leave
+     * TCP_QUICKACK mode depending on internal protocol processing and factors
+     * such as delayed ack timeouts occurring and data transfer.
+     *
+     * @since 9
+     */
+    public static final SocketOption<Boolean> SO_QUICKACK
+            = new ExtSocketOption<Boolean>("SO_QUICKACK", Boolean.class);
 }