Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751171AbVIDUjY (ORCPT ); Sun, 4 Sep 2005 16:39:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751178AbVIDUjX (ORCPT ); Sun, 4 Sep 2005 16:39:23 -0400 Received: from mx1.redhat.com ([66.187.233.31]:53131 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1751171AbVIDUjX (ORCPT ); Sun, 4 Sep 2005 16:39:23 -0400 Date: Sun, 4 Sep 2005 16:37:25 -0400 From: Dave Jones To: Bas Westerbaan Cc: Adrian Bunk , Pekka Enberg , Paul Misner , linux-kernel@vger.kernel.org Subject: Re: RFC: i386: kill !4KSTACKS Message-ID: <20050904203725.GB4715@redhat.com> Mail-Followup-To: Dave Jones , Bas Westerbaan , Adrian Bunk , Pekka Enberg , Paul Misner , linux-kernel@vger.kernel.org References: <20050902060830.84977.qmail@web50208.mail.yahoo.com> <200509041549.17512.vda@ilport.com.ua> <200509041144.13145.paul@misner.org> <84144f02050904100721d3844d@mail.gmail.com> <6880bed305090410127f82a59f@mail.gmail.com> <20050904193350.GA3741@stusta.de> <6880bed305090413132c37fed3@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6880bed305090413132c37fed3@mail.gmail.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1937 Lines: 48 On Sun, Sep 04, 2005 at 10:13:10PM +0200, Bas Westerbaan wrote: > > > Though 4K stacks are used a lot, they probably aren't used on all > > > configurations yet. Other situations may arise where 8K stacks may be > > > preferred. It is too early to kill 8K stacks imho. > > > > Please name situations where 8K stacks may be preferred that do not > > involve binary-only modules. > > I meant that there could be situations, which have not yet been found, And the boogeyman might really exist too. This is just hypotetical hand-waving. > where it could be preferred to use 8K stacks instead of 4K. When you > switch from having 8K stacks as default to 4K stacks without > possibility for 8K stacks you'd possibly encounter these yet to be > found situations. Fedora kernels have been built with 4K stacks for a long time. (Since even before the option went upstream). The only things that have been reported to have problems with 4KB stacks are.. - NDISwrapper / driverloader. (Shock, horror - no-one cares). - XFS when used in conjunction with RAID Fixed now ? (Though Neil Brown does have a pending patch for md to make that use less stack, which will also help). - Reiser4 Fixed 'soon'. > When on the other hand the 4K stacks are set as default, leaving the > option in, instead of removing it, these possible situations, when > found, could be resolved (temporarilly) by switching back to 8K > stacks. > > After a while having 4K stacks as default would be a better time to > decide whether to remove the option or not instead of now. This is what was proposed not long after the option got merged. "After a while" has passed by quite a stretch. Dave - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/