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 09:38:54 UTC 2016
Hi, I will read this article and get understand what tcpinfo_rtt is.
Thank you very much!
2016-12-16 16:15 GMT+08:00 Ruslan Ermilov <ru at nginx.com>:
> 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
> > 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
> > to the server on tcp layer.
> > and what about the rttvar, snd_cwnd and rcv_space?
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