From owner-freebsd-current@FreeBSD.ORG Fri Dec 23 20:12:15 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D9783106564A; Fri, 23 Dec 2011 20:12:15 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 4FB4F8FC19; Fri, 23 Dec 2011 20:12:14 +0000 (UTC) Received: from alf.home (alf.kiev.zoral.com.ua [10.1.1.177]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id pBNKC09K045578 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 23 Dec 2011 22:12:00 +0200 (EET) (envelope-from kostikbel@gmail.com) Received: from alf.home (kostik@localhost [127.0.0.1]) by alf.home (8.14.5/8.14.5) with ESMTP id pBNKC0Dr087126; Fri, 23 Dec 2011 22:12:00 +0200 (EET) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by alf.home (8.14.5/8.14.5/Submit) id pBNKC03a087125; Fri, 23 Dec 2011 22:12:00 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: alf.home: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 23 Dec 2011 22:12:00 +0200 From: Kostik Belousov To: Dimitry Andric Message-ID: <20111223201200.GM50300@deviant.kiev.zoral.com.ua> References: <4EF34E52.2040905@FreeBSD.org> <20111223005932.GA65042@freebsd.org> <25FBBF23-CDFA-429E-966D-A90409D8F2BD@gmail.com> <201112230937.08971.jhb@freebsd.org> <20111223160032.GA18839@freebsd.org> <4EF4B46E.7000405@FreeBSD.org> <20111223175504.GK50300@deviant.kiev.zoral.com.ua> <4EF4D0C0.7080808@FreeBSD.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="rYuqshf/sHk+ZWuy" Content-Disposition: inline In-Reply-To: <4EF4D0C0.7080808@FreeBSD.org> User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-3.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: Garrett Cooper , Alexander Best , freebsd-current@freebsd.org, Benjamin Kaduk Subject: Re: [patch] Cleaning up amd64 kernel optimization options X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Dec 2011 20:12:15 -0000 --rYuqshf/sHk+ZWuy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Dec 23, 2011 at 08:04:32PM +0100, Dimitry Andric wrote: > On 2011-12-23 18:55, Kostik Belousov wrote: > >On Fri, Dec 23, 2011 at 06:03:42PM +0100, Dimitry Andric wrote: > ... > >>The only thing my patch makes sure of, is that amd64 does the same thing > >>as all other arches, e.g.: compile with a low optimization settings for > >>debug (-O, which is equivalent to -O1), compile with arch-specific high > >>optimization settings for release (-O2 plus whatever is required for the > >>arch, or lower if optimization breaks things). > > > >Release is built with -g for long time, this is where the symbol files > >in /boot/kernel comes from. >=20 > Ah, that is done via 'makeoptions DEBUG=3D-g' in the kernel configuration > file, right? I didn't realize that was kept in for a release. But even > in that case, amd64 is somehow different from the other arches, which > all get compiled with -O instead. Yes. >=20 > If people prefer that to stay as it is, I'll change the diff so only > -frename-registers gets removed when clang is used, as clang does not > support this flag. This question cannot be answered without measurement. I think that even the 'default' benchmark of buildworld over -O and -O2 kernels can be useful to continue the discussion. --rYuqshf/sHk+ZWuy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk704JAACgkQC3+MBN1Mb4i1FACdFWsC90mwoU4853B3oUXiGawD 3OUAoMGV6l+dac9wE5R4DulcLAw4Zkmd =vm4m -----END PGP SIGNATURE----- --rYuqshf/sHk+ZWuy--