From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261500AbTKXWpW (ORCPT ); Mon, 24 Nov 2003 17:45:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261506AbTKXWpW (ORCPT ); Mon, 24 Nov 2003 17:45:22 -0500 Received: from web40908.mail.yahoo.com ([66.218.78.205]:12297 "HELO web40908.mail.yahoo.com") by vger.kernel.org with SMTP id S261500AbTKXWpP (ORCPT ); Mon, 24 Nov 2003 17:45:15 -0500 Message-ID: <20031124224514.56242.qmail@web40908.mail.yahoo.com> Date: Mon, 24 Nov 2003 14:45:14 -0800 (PST) From: Bradley Chapman Subject: Re: What exactly are the issues with 2.6.0-test10 preempt? To: Linus Torvalds Cc: linux-kernel@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Mr. Torvalds, --- Linus Torvalds wrote: > > > On Mon, 24 Nov 2003, Bradley Chapman wrote: > > > > What sort of information would you like me to provide, sir? The bug you're > > discussing here isn't affecting me; CONFIG_PREEMPT has been solid on > 2.6.0-test10. > > This is on a Gateway 600S laptop with a P4-M 2Ghz processor and an i845 > Brookdale > > chipset. > > Basically, there's something strange going on, which _seems_ to be memory > corruption, and seems to correlate reasonable well (but not 100%) with > CONFIG_PREEMPT. Ah, I see. I thought there was a definite issue with a certain subsystem that just hadn't been fixed yet when CONFIG_PREEMPT=y. > > It's actually unlikely to be preemption itself that is broken: it's much > more likely that some driver or other subsystem is broken, and preempt is > just better at triggering it by making some race conditions much easier to > see due to bigger windows for them to happen. > > The problem is finding enough of a pattern to the reports to make sense of > what seems to be the common thread. A lot of people use preemption without > any trouble. Indeed. Do the same subsystems usually show the memory corruption issue with preempt active, or does it just pop up all over the place, unpredictably? > > Linus Brad ===== __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/