From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758764AbZE1MtS (ORCPT ); Thu, 28 May 2009 08:49:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762106AbZE1MtD (ORCPT ); Thu, 28 May 2009 08:49:03 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:54233 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762032AbZE1MtB (ORCPT ); Thu, 28 May 2009 08:49:01 -0400 Date: Thu, 28 May 2009 14:48:53 +0200 From: Pavel Machek To: "Michael S. Zick" Cc: "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic Message-ID: <20090528124853.GC1421@ucw.cz> References: <200905221139.26941.lkml@morethan.org> <20090522183622.GA8385@elte.hu> <4A16F62B.40207@zytor.com> <200905221721.08495.lkml@morethan.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200905221721.08495.lkml@morethan.org> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > The observation that executing an unnecessary 'lock' opcode in some > cases slows down the machine is not felt by myself to be significant > to duplicating my observations. Note: I have been wrong before. > > This is as informative as I can make the message. > > PS: *not* a single machine failure, tested on five machines, owned > by four different people, two brands, with different use histories. I have seen some problems on via c7m based machines, where some 'smart bios person' implemented EC access in AML (normally, it is accessed from ec.c driver). Maybe you have similary bad bios? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html