关于结构 tcp_info 的良好文档 [英] Good documentation on structure tcp_info

问题描述

我正在获取 tcp 连接的性能参数，其中一个参数是带宽.我打算使用从 linux 2.6 开始支持的 tcp_info 结构，它保存有关 tcp 连接的元数据.可以使用 tcp_info 上的 getsockopt() 函数调用来检索信息.我花了很多时间找到一个很好的文档来解释该结构中的所有参数，但找不到.

I am working on getting the performance parameters of a tcp connection and one these parameters is the bandwidth. I am intending to use the tcp_info structure supported from linux 2.6 onwards, which holds the meta data about a tcp connection. The information can be retrieved using the getsockopt() function call on tcp_info. I have spent lot of time finding a good documentation which explains all the parameters in that structure, but couldn't find one.

此外，我测试了一个小程序，从 tcp_info 中检索 tcp 连接的值，在那里我发现测量的 MSS 值大部分时间为零.长话短说 - 有没有要遵循的链接具有关于tcp_info 的完整详细信息，并且使用这些值是否可靠.

Also I tested a small program to retrieve the values from tcp_info for a tcp connection where I found the measured MSS values for most of the time as zero.To make long story short-Is there a link to follow for which has complete details ontcp_info and also is it reliable to use these values.

推荐答案

这是一篇相当全面的文章 由 René Pfeiffer 撰写的 linux tcp_info 的结构和使用，但有几点值得注意:

Here is a fairly comprehensive write-up of the structure and use of the linux tcp_info by René Pfeiffer but there are a couple of things worth noting:

• 作者需要反复查看这些数据，因为该结构中没有汇总统计数据.
• 作者将您引导至 tcp.c 源，它是任何这些数据含义的最终权威.
• 我不确定您希望从最大分段大小中得到什么，但希望您认为它意味着其他含义.

如果您真的对带宽的精确测量感兴趣，则需要使用被测试系统之外的测量设备，因为即使拉动 ioctls 也会影响您有兴趣了解的现象.无源线嗅探器是获得真正准确结果的唯一方法.最后，根据您的应用，带宽"是一个非常广泛的保护伞，它将许多测量(例如延迟、往返时间、可变性、抖动等)归为一类.

If you are truly interested in exact measurements of bandwidth you need to use a measurement device which is outside the system being tested as even pulling the ioctls will affect the phenomenon you are interested in knowing about. A passive wire sniffer is the only way to get truly accurate results. Finally, depending on your application, "bandwidth" is a really broad umbrella which flattens many measurements (e.g. latency, round-trip-time, variability, jitter, etc.) into one category.

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