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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