TCP Connection details

Server NGINX
1

I am using the Nginx as a reverse proxy and I want to find out the TCP
connection information on both east and west bound connections.
With the following params on the access log, I am able to get the info
about
the client TCP connection. Now, I want to find the RTT between Nginx and
the
backend webserver. Any idea how can I get this ?

$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

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2

Anyone knows about this? I feel it is very important to know the network
delay between LB and the US servers

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