From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262730AbTJPFTz (ORCPT ); Thu, 16 Oct 2003 01:19:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262736AbTJPFTz (ORCPT ); Thu, 16 Oct 2003 01:19:55 -0400 Received: from dvmwest.gt.owl.de ([62.52.24.140]:25232 "EHLO dvmwest.gt.owl.de") by vger.kernel.org with ESMTP id S262730AbTJPFTx (ORCPT ); Thu, 16 Oct 2003 01:19:53 -0400 Date: Thu, 16 Oct 2003 07:19:51 +0200 From: Jan-Benedict Glaw To: linux-kernel@vger.kernel.org Subject: Re: Unbloating the kernel, action list Message-ID: <20031016051951.GP20846@lug-owl.de> Mail-Followup-To: linux-kernel@vger.kernel.org References: <20031014214311.GC933@inwind.it> <16710000.1066170641@flay> <20031014155638.7db76874.cliffw@osdl.org> <20031015124842.GE20846@lug-owl.de> <20031015131015.GR16158@holomorphy.com> <20031015181658.GA9652@iram.es> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="V807UU2SgBo1k3+M" Content-Disposition: inline In-Reply-To: <20031015181658.GA9652@iram.es> X-Operating-System: Linux mail 2.4.18 X-gpg-fingerprint: 250D 3BCF 7127 0D8C A444 A961 1DBD 5E75 8399 E1BB X-gpg-key: wwwkeys.de.pgp.net User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --V807UU2SgBo1k3+M Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, 2003-10-15 20:16:58 +0200, Gabriel Paubert wrote in message <20031015181658.GA9652@iram.es>: > On Wed, Oct 15, 2003 at 06:10:15AM -0700, William Lee Irwin III wrote: > > On Tue, 2003-10-14 15:56:38 -0700, cliff white > > Can you quantify the performance impact of cmov emulation (or whatever > > it is)? I have a vague notion it could be hard given the daunting task > > of switching userspace around to verify it. > The other problem of the 386 is that it has a fundamental MMU flaw: > no write protection on kernel mode accesses to user space, which makes=20 > put_user() intrinsically racy on a 386 and way more bloated when it is > inlined (access_ok has to call a function which searches the VMA tree). However, this problem exists since the very first hour. Linux once really ran quite well on those machines... I've rebooted my P-Classic router last night. Maybe I can see (in two weeks or in a month or the like...) why it slows down, even with 32MB RAM... MfG, JBG --=20 Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481 "Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg fuer einen Freien Staat voll Freier B=FCrger" | im Internet! | im Ira= k! ret =3D do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TC= PA)); --V807UU2SgBo1k3+M Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/jip3Hb1edYOZ4bsRAq0bAKCC7qdYU8HDX/3srDgnQPweBWZDtwCfXwm8 fNWiZn4AN8iHO5Nd7On/9ls= =om0F -----END PGP SIGNATURE----- --V807UU2SgBo1k3+M--