From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269211AbUHZQsr (ORCPT ); Thu, 26 Aug 2004 12:48:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269201AbUHZQqY (ORCPT ); Thu, 26 Aug 2004 12:46:24 -0400 Received: from host-65-117-135-105.timesys.com ([65.117.135.105]:13233 "EHLO yoda.timesys") by vger.kernel.org with ESMTP id S269145AbUHZQjq (ORCPT ); Thu, 26 Aug 2004 12:39:46 -0400 Date: Thu, 26 Aug 2004 12:38:13 -0400 To: Lee Revell Cc: Scott Wood , Ingo Molnar , manas.saksena@timesys.com, linux-kernel , nando@ccrma.stanford.edu Subject: Re: [patch] PPC/PPC64 port of voluntary preempt patch Message-ID: <20040826163813.GA14963@yoda.timesys> References: <20040823221816.GA31671@yoda.timesys> <20040824195122.GA9949@yoda.timesys> <1093490252.5678.56.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1093490252.5678.56.camel@krustophenia.net> User-Agent: Mutt/1.5.4i From: Scott Wood Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 25, 2004 at 11:17:32PM -0400, Lee Revell wrote: > I think Scott may be on to something. There are several reports that P9 > does not work on SMP machines at all - it either doesn't boot, locks up > the first time there is heavy IRQ activity (starting KDE), or locks up > as soon as the first RT process is run. This is exactly the behavior > that would be expected if Scott is correct. See this thread: > > http://ccrma-mail.stanford.edu/pipermail/planetccrma/2004-August/005899.html > > Does anyone have P9 working on SMP? Fernando, can you see if M5 works > on SMP? If this works it would seem that the preemptible IRQs are the > problem. It worked for me on an SMP G5, but it would depend on which drivers are used; some use synchronize_irq() more than others. IIRC, though, M5 didn't have the IO-APIC fixes, so that's not likely to work well on SMP either. -Scott