From owner-freebsd-stable@FreeBSD.ORG  Mon Oct 16 03:16:18 2006
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id C04BB16A403;
	Mon, 16 Oct 2006 03:16:18 +0000 (UTC)
	(envelope-from kris@obsecurity.org)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 8043943D53;
	Mon, 16 Oct 2006 03:16:18 +0000 (GMT)
	(envelope-from kris@obsecurity.org)
Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196])
	by elvis.mu.org (Postfix) with ESMTP id 62E7B1A3C20;
	Sun, 15 Oct 2006 20:16:18 -0700 (PDT)
Received: by obsecurity.dyndns.org (Postfix, from userid 1000)
	id B29C9514B1; Sun, 15 Oct 2006 23:16:17 -0400 (EDT)
Date: Sun, 15 Oct 2006 23:16:17 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Adrian Chadd <adrian@freebsd.org>
Message-ID: <20061016031617.GB1303@xor.obsecurity.org>
References: <d763ac660610151953x69a66133v977279ab9c7e20bc@mail.gmail.com>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="GID0FwUMdk1T2AWN"
Content-Disposition: inline
In-Reply-To: <d763ac660610151953x69a66133v977279ab9c7e20bc@mail.gmail.com>
User-Agent: Mutt/1.4.2.2i
Cc: FreeBSD Stable <freebsd-stable@freebsd.org>
Subject: Re: kernel profiling?
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Oct 2006 03:16:18 -0000


--GID0FwUMdk1T2AWN
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Oct 16, 2006 at 10:53:36AM +0800, Adrian Chadd wrote:
> Hiya,
>=20
> Whats the "right" way to grab kernel profiling data these days?
>=20
> I've tried using the kernel profiling w/ kgmon and gprof but the top CPU
> wasters are the profiling functions themselves, quickly followed by
> write_eflags(). I'm not sure this is valid at all.
>=20
> I'm running 6-stable on an Athlon 1800XP, so its uniprocessor and
> (relatively) slow. I'm hitting the server rather hard with a few thousand
> TCP connections a second; I'm trying to figure out where my ~60% of kernel
> time and ~35% of interrupt time is going.

pmc can be extremely useful although it doesn't do call graphs.

Kris

--GID0FwUMdk1T2AWN
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (FreeBSD)

iD8DBQFFMvmBWry0BWjoQKURAuCjAKDHos6pk6N+XKmS4EyvDC1OdAz08QCgv8EK
3KKoKLIvXNPlYSw93RcQcW4=
=jxxX
-----END PGP SIGNATURE-----

--GID0FwUMdk1T2AWN--