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? Thanks!
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