Date: Tue, 30 Oct 2012 07:05:41 -0700 (PDT) From: Jack Mc Lauren <jack.mclauren@yahoo.com> To: "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org> Subject: GENERIC kernel configuraion Message-ID: <1351605941.79450.YahooMailNeo@web126002.mail.ne1.yahoo.com>
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Hello Does customizing (commenting unused devices in GENERIC) kernel in /usr/src/amd64/conf cause nanobsd image get lighter ?? From owner-freebsd-embedded@FreeBSD.ORG Tue Oct 30 14:50:35 2012 Return-Path: <owner-freebsd-embedded@FreeBSD.ORG> Delivered-To: freebsd-embedded@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 973AAB17 for <freebsd-embedded@freebsd.org>; Tue, 30 Oct 2012 14:50:35 +0000 (UTC) (envelope-from freebsd@psconsult.nl) Received: from mx1.psconsult.nl (unknown [IPv6:2001:7b8:30f:e0::5059:ee8a]) by mx1.freebsd.org (Postfix) with ESMTP id 45D878FC0C for <freebsd-embedded@freebsd.org>; Tue, 30 Oct 2012 14:50:32 +0000 (UTC) Received: from mx1.psconsult.nl (mx1.hvnu.psconsult.nl [46.44.189.154]) by mx1.psconsult.nl (8.14.5/8.14.4) with ESMTP id q9UEoOMX017534 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for <freebsd-embedded@freebsd.org>; Tue, 30 Oct 2012 15:50:29 +0100 (CET) (envelope-from freebsd@psconsult.nl) Received: (from paul@localhost) by mx1.psconsult.nl (8.14.5/8.14.4/Submit) id q9UEoOFc017533 for freebsd-embedded@freebsd.org; Tue, 30 Oct 2012 15:50:24 +0100 (CET) (envelope-from freebsd@psconsult.nl) X-Authentication-Warning: mx1.psconsult.nl: paul set sender to freebsd@psconsult.nl using -f Date: Tue, 30 Oct 2012 15:50:24 +0100 From: Paul Schenkeveld <freebsd@psconsult.nl> To: freebsd-embedded@freebsd.org Subject: Re: GENERIC kernel configuraion Message-ID: <20121030145024.GA16785@psconsult.nl> References: <1351605941.79450.YahooMailNeo@web126002.mail.ne1.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1351605941.79450.YahooMailNeo@web126002.mail.ne1.yahoo.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-BeenThere: freebsd-embedded@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Dedicated and Embedded Systems <freebsd-embedded.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-embedded>, <mailto:freebsd-embedded-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-embedded>; List-Post: <mailto:freebsd-embedded@freebsd.org> List-Help: <mailto:freebsd-embedded-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-embedded>, <mailto:freebsd-embedded-request@freebsd.org?subject=subscribe> X-List-Received-Date: Tue, 30 Oct 2012 14:50:35 -0000 On Tue, Oct 30, 2012 at 07:05:41AM -0700, Jack Mc Lauren wrote: > Hello > > Does customizing (commenting unused devices in GENERIC) kernel in /usr/src/amd64/conf cause nanobsd image get lighter ?? Here are two amd64 NanoBSD kernels I've archived: # ls -ls kernel1 kernel2 15 -r-xr-xr-x 1 root wheel 15572950 Apr 9 2012 kernel1 7 -r-xr-xr-x 1 root wheel 6921921 Jul 25 11:27 kernel1 # size kernel1 kernel2 text data bss dec hex filename 12011364 1331748 1137248 14480360 dcf3e8 kernel1 5155629 513459 637256 6306344 603a28 kernel2 The first one is FreeBSD 9.0, the second one FreeBSD 8.3 but 9.0 is not twice as big as 8.3. So yes, trimming /usr/src/amd64/conf can make a big difference! If memory is your constraint, trim the kernel as much as possible, don't forget to strip things like SCTP, NFS*, INET6, MAC etc. if you don't need them and leave "makeoptions DEBUG=-g" out too. If it's the size of your flash image you worry about, put in a line like makeoptions MODULES_OVERRIDE="" to not build/install kernel modules or include only those that you really need. /boot/kernel takes almost 50% of the space in a NanoBSD image with a generic kernel and all modules built. Another thing that can save a lot of space on your flash image is tuning CONF_WORLD, CONF_BUILD and CONF_INSTALL (see src/tools/build/options/ for an explanation of each option). This may take several iterations before you get it right though because sometimes it's not immediately visible which options are required by other ones (eg. if you build with INET6 enabled, you appear to need KVM and KVM_SUPPORT too). HTH Paul Schenkeveld
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