什么是TCP同步?
TCP同步是指在一段时间内网络处于网络利用率(Network Utilization)很低的使用状态,降低了整体吞吐量(throughput)的现象。
随着网络的普及,信息交流与信息共享成为人们日常生活中必不可少的一部分。
而网络中信息(数据包)的不断增长,必然引起网络拥塞。
于是,拥塞避免显得尤为重要,现在Internet上使用得比较广泛的拥塞避免机制是丢尾(DropTail):当队列的长度达到规定的最大长度时,所有到来的报文都被丢弃。
这种丢弃策略会引发tcp 全局同步(global synchronization)现象——由于Internet上数据(Traffic)的突发本质,到达路由器的数据包也往往是突发的。
如果队列是满的或者几乎是满的,就会导致在短时间内连续大量地丢封包。
而TCP流具有自适应特性(Adaptiveness),来源端发现数据包丢失就急剧地减小发送窗口(congestion window,cwnd),数据包到达速率就会迅速下降,于是网络拥塞得以解除。
但来源端得知网络不再拥塞后又开始增加发送速度,最终又造成网络拥塞,而且这种现象常常会周而复始地进行下去,从而在一段时间内网络处于网络利用率(Network Utilization)很低的使用状态,降低了整体吞吐量(throughput),这就是所谓地"TCP全局同步"现象。
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utilization是什么意思
With the development of networks,people's life and work of earth-shaking changes have taken place,people and network relations are becoming closer and closer,and even some people say that people are living in the network,which is now full of people that the dependence of the network.This will also note from the other people on the network bandwidth more and more attention now,not just enterprises,or even an individual,has become attached great importance to the bandwidth management,because in this rapidly developing society,speed is life,speed Is money,and therefore reasonable for the management of network bandwidth has become very important,the combination of the following is a case to analyze how efficient bandwidth management to improve the management system and improve the utilization of network
谁知道sirota是哪里的公司?是做第三方调查的一家公司,谁有这家公...
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