From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263577AbTDNR30 (for ); Mon, 14 Apr 2003 13:29:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263579AbTDNR30 (for ); Mon, 14 Apr 2003 13:29:26 -0400 Received: from lindsey.linux-systeme.com ([80.190.48.67]:14609 "EHLO mx00.linux-systeme.com") by vger.kernel.org with ESMTP id S263577AbTDNR3Z (for ); Mon, 14 Apr 2003 13:29:25 -0400 From: Marc-Christian Petersen Organization: Working Overloaded Linux Kernel To: Joe Korty , Robert Love Subject: Re: [PATCH] 2.4 preemption bug in bh_kmap_irq Date: Mon, 14 Apr 2003 19:40:14 +0200 User-Agent: KMail/1.5.1 Cc: linux-kernel@vger.kernel.org References: <20030414172730.GA17451@rudolph.ccur.com> In-Reply-To: <20030414172730.GA17451@rudolph.ccur.com> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200304141938.26328.m.c.p@wolk-project.de> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Monday 14 April 2003 19:27, Joe Korty wrote: Hi Joe, > The below patch compiles and boots ide=nodma on my preempt 2.4 kernel > on the one motherboard that had the problem. Before this patch, the > kernel would not even boot for that motherboard. I also applied and > test booted a pure 2.4.21-pre5 kernel with this patch. > The patch implements my preference for simplicity, so you may want to > take some other approach if maximal performance is what you want. yep, and here is the problem ^^^^^^^^. Your patch seems ok but is horribly slow. I've tried it first the day you submitted the patch. It's even alot slower than w/o Preempt or CONFIG_PREEMPT to no. My Celeron 1,3GHz with 512 MB RAM felt like good old 486SX/25 while doing, for example, a kernel compilation :( ciao, Marc