title: Good documentation on structure tcp_info
body: <p>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 <code>tcp_info</code> structure supported from linux 2.6 onwards, which holds the meta data about a tcp connection. The information can be retrieved using the <code>getsockopt()</code> function call on <code>tcp_info</code>. I have spent lot of time finding a good documentation which explains all the parameters in that structure, but couldn't find one.</p>
  
  <p>Also I tested a small program to retrieve the values from <code>tcp_info</code> 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 on<code>tcp_info</code> and also is it reliable to use these values.</p>