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

问题描述

我正在努力获取tcp连接的性能参数，这些参数是带宽。我打算使用从linux 2.6起支持的 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，解释了该结构中的所有参数，但是找不到一个。

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.

我测试了一个小程序来检索对于tcp连接，从 tcp_info 的值，我发现大多数时间的测量的MSS值为零。做长的故事短 - 是否有一个链接， tcp_info 的完整详细信息，并且使用这些值也是可靠的。

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

p>这里是一个关于linux tcp_info的结构和使用的相当全面的写作 RenéPfeiffer，但有几件值得注意的事情：

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:

• 作者需要查看这些重复的数据，因为没有聚合




• 作者将指向tcp.c来源作为任何这些数据含义的最终权威。我不知道你希望从最大分段大小获得什么，但希望你认为它意味着其他的东西。

如果你真正感兴趣的精确测量带宽你需要使用的测量设备，在被测试的系统以外，甚至拉动 ioctls 将影响你感兴趣的现象关于。被动电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，带宽是一个非常宽泛的伞，将许多测量（例如延迟，往返时间，变化性，抖动等）变成一个类别。

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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