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What's the meaning of Nginx variables of "$tcpinfo_rtt, $tcpinfo_rttvar, $tcpinfo_snd_cwnd, $tcpinfo_rcv_space"

Posted by yanqun sun 
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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Hello,

On 12/16/16 10:09 AM, 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?
>
I would suggest to check any tcp 101c-like book for the explanation.

--
Maxim Konovalov
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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?

http://linuxgazette.net/136/pfeiffer.html
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http://mailman.nginx.org/mailman/listinfo/nginx
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 <[email protected]>:

> 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?
>
> http://linuxgazette.net/136/pfeiffer.html
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx
>
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