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Message-Id: <1189461284.11066.10.camel@w-sridhar2.beaverton.ibm.com>
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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