netdev - Re: why does tcp_v[46]_conn_request not inc MIB stats

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Date:	Mon, 10 Sep 2007 14:54:43 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: why does tcp_v[46]_conn_request not inc MIB stats

On Mon, 2007-09-10 at 11:42 -0700, Rick Jones wrote:
> I've been digging around to see about inducing /proc/net/tcp to show 
> some "interesting" things for listen sockets (eg backlog depth, its max, 
> and dropped connection requests).

backlog depth(acceptq length) for a listening socket should be available
with the newer kernels. The following patch exports this value via the rx_queue
field in /proc/net/tcp.
 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=47da8ee681d04e68ca1b1812c10e28162150d453

>   While there I've noticed that both 
> tcp_v[46]_syn_recv_sock and tcp_v[46]conn_request both check that the 
> listen queue is full, but only tcp_v[46]_syn_recv_sock increments some 
> mib stats for dropped connection requests.
> 
> Is that deliberate, or is that a hole in the stats?

looks like it is a hole in the stats. I think we should increment
LISTENOVERFLOWS or LISTENDROPS in tcp_v[46]_conn_request too if the
SYN is dropped.

Thanks
Sridhar

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