Sridhar Samudrala wrote:
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
Yep, I see it in the 2.6.23-rc5 tree I'm using. At the risk of yet
another "merely practice" patching excercise I'm putting together a
patch which will also return that in a TCP_INFO and add the max backlog
(to the tx_queue field)
While doing that, I've noticed that
Documenation/networking/proc-net-tcp.txt (?) talks about a tcp6_get_info
which I cannot find anywhere in the tree. I'm not sure if that simply
means that tcp_get_info is what is used for a "tcp6" connection and the
text can simply be removed from the documentation, or if it is called
something else.
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.
OK. Now, can we get a third to Sridhar's second?-)
rick jones
struggling through the maze of twisty routines for connection establishment
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