/* * Copyright (c) 2004, Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the uIP TCP/IP stack * * Author: Adam Dunkels * * $Id: uip-split.h,v 1.1.1.1 2007-08-26 23:04:08 patacongo Exp $ */ /** * \addtogroup uip * @{ */ /** * \defgroup uipsplit uIP TCP throughput booster hack * @{ * * The basic uIP TCP implementation only allows each TCP connection to * have a single TCP segment in flight at any given time. Because of * the delayed ACK algorithm employed by most TCP receivers, uIP's * limit on the amount of in-flight TCP segments seriously reduces the * maximum achievable throughput for sending data from uIP. * * The uip-split module is a hack which tries to remedy this * situation. By splitting maximum sized outgoing TCP segments into * two, the delayed ACK algorithm is not invoked at TCP * receivers. This improves the throughput when sending data from uIP * by orders of magnitude. * * The uip-split module uses the uip-fw module (uIP IP packet * forwarding) for sending packets. Therefore, the uip-fw module must * be set up with the appropriate network interfaces for this module * to work. */ /** * \file * Module for splitting outbound TCP segments in two to avoid the * delayed ACK throughput degradation. * \author * Adam Dunkels * */ #ifndef __UIP_SPLIT_H__ #define __UIP_SPLIT_H__ /** * Handle outgoing packets. * * This function inspects an outgoing packet in the uip_buf buffer and * sends it out using the uip_fw_output() function. If the packet is a * full-sized TCP segment it will be split into two segments and * transmitted separately. This function should be called instead of * the actual device driver output function, or the uip_fw_output() * function. * * The headers of the outgoing packet is assumed to be in the uip_buf * buffer and the payload is assumed to be wherever uip_appdata * points. The length of the outgoing packet is assumed to be in the * uip_len variable. * */ void uip_split_output(void); #endif /* __UIP_SPLIT_H__ */ /** @} */ /** @} */