--- a/jdk/src/java.base/windows/native/libnet/net_util_md.c	Fri Oct 17 10:59:32 2014 +0100
+++ b/jdk/src/java.base/windows/native/libnet/net_util_md.c	Sun Oct 19 11:52:53 2014 +0100
@@ -29,6 +29,9 @@
 #include "net_util.h"
 #include "jni.h"
 
+// Taken from mstcpip.h in Windows SDK 8.0 or newer.
+#define SIO_LOOPBACK_FAST_PATH              _WSAIOW(IOC_VENDOR,16)
+
 #ifndef IPTOS_TOS_MASK
 #define IPTOS_TOS_MASK 0x1e
 #endif
@@ -844,6 +847,25 @@
     }
 }
 
+/**
+ * Enables SIO_LOOPBACK_FAST_PATH
+ */
+JNIEXPORT jint JNICALL
+NET_EnableFastTcpLoopback(int fd) {
+    int enabled = 1;
+    DWORD result_byte_count = -1;
+    int result = WSAIoctl(fd,
+                          SIO_LOOPBACK_FAST_PATH,
+                          &enabled,
+                          sizeof(enabled),
+                          NULL,
+                          0,
+                          &result_byte_count,
+                          NULL,
+                          NULL);
+    return result == SOCKET_ERROR ? WSAGetLastError() : 0;
+}
+
 /* If address types is IPv6, then IPv6 must be available. Otherwise
  * no address can be generated. In the case of an IPv4 Inetaddress this
  * method will return an IPv4 mapped address where IPv6 is available and