From owner-freebsd-questions@FreeBSD.ORG  Mon Mar 10 13:28:36 2008
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A3DF6106566B
	for <freebsd-questions@freebsd.org>;
	Mon, 10 Mar 2008 13:28:36 +0000 (UTC)
	(envelope-from mario.lobo@ipad.com.br)
Received: from ipad.com.br (recife.ipad.com.br [200.249.204.129])
	by mx1.freebsd.org (Postfix) with SMTP id AFD418FC17
	for <freebsd-questions@freebsd.org>;
	Mon, 10 Mar 2008 13:28:35 +0000 (UTC)
	(envelope-from mario.lobo@ipad.com.br)
Received: (qmail 8190 invoked by uid 79); 10 Mar 2008 13:01:52 -0000
Received: from 192.168.64.1 by recife.ipad.com.br (envelope-from
	<mario.lobo@ipad.com.br>, uid 1008) with qmail-scanner-1.25-st-qms 
	(clamdscan: 0.92rc2/6188. spamassassin: 3.1.8. perlscan: 1.25-st-qms. 
	Clear:RC:1(192.168.64.1):. 
	Processed in 0.019554 secs); 10 Mar 2008 13:01:52 -0000
X-Antivirus-IPAD-Mail-From: mario.lobo@ipad.com.br via recife.ipad.com.br
X-Antivirus-IPAD: 1.25-st-qms (Clear:RC:1(192.168.64.1):. Processed in
	0.019554 secs Process 8183)
Received: from unknown (HELO lobo.ipad.com.br)
	(mario.lobo@ipad.com.br@192.168.64.1)
	by ipad.com.br with SMTP; 10 Mar 2008 13:01:52 -0000
From: Mario Lobo <mario.lobo@ipad.com.br>
Organization: IPAD
To: freebsd-questions@freebsd.org
Date: Mon, 10 Mar 2008 10:01:57 -0300
User-Agent: KMail/1.9.7
X-Face: ,55PTLsK{\?org*WH[[%>IJpi}pb?lwVxsDL<:}(Ti2yN(w/k\"enXx"?CbN[hp<!l)o6)=?utf-8?q?=0A=09p=60*W8?=";
	R_8L]_u:HO7jC#Qx[H/#1C{!qn1gz3}QRs9tuiz4+MJary8d-FpL0X'T[@=?utf-8?q?=3Dd4=26=5D=0A=09-=27U!W?=<b%qS9d|2pqAr;
	-SJ*qpxBV<.G`]jYY_?4n]s=K3*X5'Q5M3G'H*HF
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
Message-Id: <200803101001.58362.mario.lobo@ipad.com.br>
Subject: [OT?] tcpdump overhead
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 10 Mar 2008 13:28:36 -0000

Hi there;

=46orgive this possible OT (and lame) question.

I am writing a final paper for a PG course and  I need to take precise=20
measurements on network performance. I gonna be doing lots of packet dumps=
=20
and I would like to know you guys' opinion on how much of tcpdump overhead=
=20
(if meaningful for these measurements) I should take into account.

If there are any readings on the subject you could point me to...

Thanks
=2D-=20
Mario Lobo
Seguran=E7a de Redes - Desenvolvimento e An=E1lise
IPAD - Instituto de Pesquisa e Apoio ao Desenvolvimento Tecnol=F3gico e=20
Cient=EDfico