From owner-freebsd-doc  Wed Jul 12  7:15:28 2000
Delivered-To: freebsd-doc@freebsd.org
Received: from scientia.demon.co.uk (scientia.demon.co.uk [212.228.14.13])
	by hub.freebsd.org (Postfix) with ESMTP id 7FB8837BCC0
	for <doc@freebsd.org>; Wed, 12 Jul 2000 07:15:20 -0700 (PDT)
	(envelope-from ben@scientia.demon.co.uk)
Received: from strontium.scientia.demon.co.uk ([192.168.91.36] ident=exim)
	by scientia.demon.co.uk with esmtp (Exim 3.15 #1)
	id 13CMyS-000PoU-00; Wed, 12 Jul 2000 14:54:52 +0100
Received: (from ben) by strontium.scientia.demon.co.uk (Exim 3.15 #1)
	id 13CMyR-0002vs-00; Wed, 12 Jul 2000 14:54:51 +0100
Date: Wed, 12 Jul 2000 14:54:51 +0100
From: Ben Smithurst <ben@FreeBSD.org>
To: Greg Lehey <grog@lemis.com>
Cc: doc@FreeBSD.ORG
Subject: Re: small update to handbook about debug kernels
Message-ID: <20000712145451.D11000@strontium.scientia.demon.co.uk>
References: <20000711131846.L11000@strontium.scientia.demon.co.uk> <20000712103922.A29642@wantadilla.lemis.com>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-md5;
	protocol="application/pgp-signature"; boundary="ZuvoxmZMh0nHqhEq"
Content-Disposition: inline
User-Agent: Mutt/1.2i
In-Reply-To: <20000712103922.A29642@wantadilla.lemis.com>
Sender: owner-freebsd-doc@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


--ZuvoxmZMh0nHqhEq
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Greg Lehey wrote:

> I think you should look from the viewpoint of the modern kernel:=20
>=20
>   If you are using version 2 or 3 of FreeBSD, you will need to strip
>   the kernel manually...  Note that if you run an a.out kernel with
>   debugging symbols, the whole kernel will be loaded into memory...

Is this better:

    <para>If you are using FreeBSD 3 or earlier, you should make a stripped
      copy of the debug kernel, rather than installing the large debug
      kernel itself:</para>

    <screen>&prompt.root; <userinput>cp kernel kernel.debug</userinput>
&prompt.root; <userinput>strip -g kernel</userinput></screen>

    <para>This stage isn't necessary, but it is recommended.  (In
      FreeBSD 4 and later releases this step is performed automatically
      at the end of the kernel <command>make</command> process.) =20
      When the kernel has been stripped, either automatically or by
      using the commands above, you may install it as usual by typing
      <command>make install</command>.</para>

    <para>If you install and boot the debug kernel, without stripping
      it as described above, symbol table lookup time for some programs
      will drastically increase.  Note also that older releases of
      FreeBSD (up to but not including 3.1) used a.out kernels by
      default, which must have their symbol tables permanently resident
      in physical memory.  With the larger symbol table in an unstripped
      debug kernel, this is wasteful.  Recent FreeBSD releases use ELF
      kernels where this is no longer a problem.</para>

? It's a bit longer, but has a bit more detail, I think.

--=20
Ben Smithurst / ben@FreeBSD.org / PGP: 0x99392F7D

--ZuvoxmZMh0nHqhEq
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 5.0i for non-commercial use
MessageID: m/hJuNlHpHeZC1FDJeUP3gchNeddA3aq

iQCVAwUBOWx4qSsPVtiZOS99AQGMFAP+PNc7GYKdkWUc/oG5RMsjA7Id8JIheYPl
Cek2N0FXKvGb6F3Vmrf+HMrYE3cdrvP7nbdWLNR6MAdotDybhzz0jn6HxmH+jb39
QqyxBERywvfvsjvbdljlCsKM8ltYPHh5Tzer1z1KbRg/OUlnnHUVJRwa1Va7ANFd
rjJcmgnpNEs=
=mDEF
-----END PGP SIGNATURE-----

--ZuvoxmZMh0nHqhEq--


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-doc" in the body of the message