netdev - Re: [PATCH] Add useful per-connection TCP stats for diagnosis purpose.

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Date:	Fri, 18 Mar 2011 07:05:24 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jerry Chu <hkchu@...gle.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] Add useful per-connection TCP stats for diagnosis
 purpose.

Le jeudi 17 mars 2011 à 21:33 -0700, Jerry Chu a écrit :

> Yes I'm familiar with ss and how inet_csk_diag_fill() calls into
> tcp_diag_get_info(),..., etc. Like I mentioned previously the netlink
> interface
> requires a new version of reader app (e.g., ss) to ship every time a new
> counter is added and exported by the kernel, whereas /proc/net/tcp does
> not have such a problem.
> 
> Anyway I can add a INET_DIAG_INFO_EXT of some sort to netlink in
> addition to /proc/net/tcp. That's easy to do.
> 

I suggest adding a getsockopt() or something to gather stats for one
socket. On a loaded machine, /proc/net/tcp is damn slow.

We have TCP_INFO, we could add TCP_INFO_EXT, but taking care of choosing
an interface allowing for extension of the structure.

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