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