From owner-freebsd-arch@FreeBSD.ORG Wed Feb 26 21:48:17 2014 Return-Path: Delivered-To: arch@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 107F2A57 for ; Wed, 26 Feb 2014 21:48:17 +0000 (UTC) Received: from h2.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id E4197106D for ; Wed, 26 Feb 2014 21:48:16 +0000 (UTC) Received: from h2.funkthat.com (localhost [127.0.0.1]) by h2.funkthat.com (8.14.3/8.14.3) with ESMTP id s1QLmGs6041462 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 26 Feb 2014 13:48:16 -0800 (PST) (envelope-from jmg@h2.funkthat.com) Received: (from jmg@localhost) by h2.funkthat.com (8.14.3/8.14.3/Submit) id s1QLmGDG041461 for arch@FreeBSD.org; Wed, 26 Feb 2014 13:48:16 -0800 (PST) (envelope-from jmg) Date: Wed, 26 Feb 2014 13:48:16 -0800 From: John-Mark Gurney To: arch@FreeBSD.org Subject: small kernel kernel option... Message-ID: <20140226214816.GB92037@funkthat.com> Mail-Followup-To: arch@FreeBSD.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.3i X-Operating-System: FreeBSD 7.2-RELEASE i386 X-PGP-Fingerprint: 54BA 873B 6515 3F10 9E88 9322 9CB1 8F74 6D3F A396 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.2 (h2.funkthat.com [127.0.0.1]); Wed, 26 Feb 2014 13:48:16 -0800 (PST) X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Feb 2014 21:48:17 -0000 I'm about to commit a change to sha256 to speed it up, but the cost of that speed up is an increase in code/data size from just under 1k to almost 9k (as measured on amd64)... this increase is from unrolling a loop.. Maybe we should have a global kernel option, SMALL_KERNEL, or something similar that can be used to shrink code size for those that are trying to build small embedded devices... Or do we already have this option, but I just don't know about it? I know 8k isn't much, but, a billion here and a billion there and pretty soon you're talking about real money.. :) Comments? -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."