netdev - O(n^2) or worse ? cat /proc/net/tcp

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Date:	Mon, 24 Mar 2008 00:43:07 +0200
From:	Matti Aarnio <matti.aarnio@...iler.org>
To:	netdev@...r.kernel.org
Subject: O(n^2) or worse ?   cat /proc/net/tcp

I have about 750 TCP socket on one multi-threaded server application, and 
about 250 on three single-threaded clients.

I did observe odd slowness at first with  "lsof -p .."  program, then at
"netstat -na".  Same slowdown happens with:  cat /proc/net/tcp
(that 'cat' took 25 seconds...)

Sure this is not earth shatterinly dangerous thing, rather a nuisance
when a monitoring application is not as fast as one would expect.

Application works fine, though.

  /Matti Aarnio
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