[collectd] netlink patch against tcpconns.c

[Jacek Jedrzejczak]

Hi,

becasue reading from /proc/net/tcp[6] takes a LOT of time, especially 
when there are thousands of connections. I've adopted a patch on netstat 
that uses netlink interface:

http://www.ducksong.com/misc/netstat-netlink-diag-patch.txt

as described in:

http://amailbox.org/mailarchive/linux-netdev/2008/8/26/3086024

The difference is like night and day. (netstat -n -t vs ss -a -n t)

Maybe someone is interested in making it pretty so it could be added to 
the tree.

Thank you for collectd,

	Jack.
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