--- /dev/null
+/*\r
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.\r
+ * All rights reserved.\r
+ *\r
+ * Redistribution and use in source and binary forms, with or without modification,\r
+ * are permitted provided that the following conditions are met:\r
+ *\r
+ * 1. Redistributions of source code must retain the above copyright notice,\r
+ * this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright notice,\r
+ * this list of conditions and the following disclaimer in the documentation\r
+ * and/or other materials provided with the distribution.\r
+ * 3. The name of the author may not be used to endorse or promote products\r
+ * derived from this software without specific prior written permission.\r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED\r
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\r
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT\r
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\r
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT\r
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\r
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY\r
+ * OF SUCH DAMAGE.\r
+ *\r
+ * This file is part of the lwIP TCP/IP stack.\r
+ *\r
+ * Author: Adam Dunkels <adam@sics.se>\r
+ *\r
+ */\r
+#ifndef __PERF_H__\r
+#define __PERF_H__\r
+\r
+/* ------------------------ Defines --------------------------------------- */\r
+#define PERF_START /* null definition */\r
+#define PERF_STOP(x) /* null definition */\r
+\r
+#endif\r