On Fri, Dec 16, 2016 at 03:09:14PM +0800, yanqun sun wrote:
> Hi, all:
> I want to get the network latency between the users and my Nginx servers
> on tcp layer. I searched about this and found several Nginx variables
> bellow:
>
> $tcpinfo_rtt, $tcpinfo_rttvar, $tcpinfo_snd_cwnd, $tcpinfo_rcv_space
> information about the client TCP connection; available on systems that
> support the TCP_INFO socket option
>
>
> So does anybody can make an explanation for those variables?
> I think *$tcpinfo_rtt* probably means the round trip time from the client
> to the server on tcp layer.
> and what about the rttvar, snd_cwnd and rcv_space?

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