嵌入式Internet中Nagle算法及其应用研究  

Nagle algorithm and its application research in embedded Internet

作　　者：王宝宝[1] 余世明[1] 王振宇[1] 

机构地区：[1]浙江工业大学信息工程学院,杭州310023

出　　处：《中国工程科学》2014年第2期101-105,共5页Strategic Study of CAE

基　　金：浙江省重大科技专项(2011C11089)

摘　　要：嵌入式Internet中使用短帧数据包,使得网络带宽的利用率极低,拥塞发生的可能性加大。标准transmission control protocol(TCP)协议中应用Nagle算法减少短帧数量。通过ARM7 32位micro control unit(MCU)和上位机personal computer(PC)构建嵌入式Internet网络,分析Nagle算法的原理和工作机制。针对嵌入式系统中Nagle算法和上位机延迟确认策略交互产生的暂时性"死锁"问题,提出了在不修改Nagle算法的基础上,通过提高采样频率或者填充缓冲区的方法来避免暂时性"死锁"。测试表明,该方案是有效可行的。The existence of small packets in embedded Internet lead to low bandwidth effi-ciency and even congestion. The Nagle algorithm was applied by standard transmission control protocol（TCP）protocol to reduce the number of small packets. The paper builds embedded In-ternet network based on ARM7 32 bits micro control unit（MCU）and personal computer（PC）, analyses the principle and working mechanism of Nagle,and suggests an approach to resolve the temporary“deadlock”created by the interaction between the Nagle algorithm and the de-layed ACK policy without modifying the Nagle algorithm through improving sampling frequen-cy or filling the buffer in embedded system. The experimental results indicate that this approach is effective and reliable.

关 键 词：NAGLE算法 死锁 延迟确认策略 ARM7 嵌入式INTERNET 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]