TCP Connection details

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

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,258958,258958#msg-258958

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

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,258958,259412#msg-259412

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