What's the meaning of Nginx variables of "$tcpinfo_rtt, $tcpinfo_rttvar, $tcpinfo_snd_cwnd, $tcpinfo_rcv_space"
forsunyq at gmail.com
Fri Dec 16 07:09:14 UTC 2016
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
$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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