From: Andi Kleen <andi@firstfloor.org>
To: Matti Aarnio <matti.aarnio@zmailer.org>
Cc: netdev@vger.kernel.org
Subject: Re: O(n^2) or worse ? cat /proc/net/tcp
Date: 24 Mar 2008 05:06:28 +0100 [thread overview]
Message-ID: <87lk487ol7.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080323224307.GL3700@mea-ext.zmailer.org>
Matti Aarnio <matti.aarnio@zmailer.org> writes:
>
> I did observe odd slowness at first with "lsof -p .." program,
You could oprofile it.
> then at
> "netstat -na". Same slowdown happens with: cat /proc/net/tcp
> (that 'cat' took 25 seconds...)
/proc/net/tcp should be only O(n^2) if the application does a lot of
open()/seek()/read()/close() for very small chunks, but at least netstat
doesn't do that. Not sure about lsof though.
-Andi
next prev parent reply other threads:[~2008-03-24 4:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-23 22:43 O(n^2) or worse ? cat /proc/net/tcp Matti Aarnio
2008-03-23 23:20 ` David Miller
2008-03-24 3:33 ` Matti Aarnio
2008-03-27 11:49 ` Matti Aarnio
2008-03-27 21:28 ` David Miller
2008-03-24 4:06 ` Andi Kleen [this message]
2008-03-27 10:51 ` Matti Aarnio
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