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有了这个理论模型，我们就大概知道应该把buffer调整为多大了，

实际上就是应该让一次写操作的数据把网络延时，导致浪费的带宽填满。

在延时为400ms，带宽为125mB/s的网络上，要填满延时期间的浪费带宽的字节数该是多少呢？那就是著名的带宽延时积了。

即： 带宽(125mB/s) 每秒下载的MB值 X 延时rtt(0.2s) = 50m （多少Mx1024x1024）=net.ipv4.tcp_wmem数值

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