Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267681AbUJCCOU (ORCPT ); Sat, 2 Oct 2004 22:14:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267678AbUJCCOU (ORCPT ); Sat, 2 Oct 2004 22:14:20 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:21165 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S267681AbUJCCOM (ORCPT ); Sat, 2 Oct 2004 22:14:12 -0400 Subject: Re: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7 From: Lee Revell To: Ingo Molnar Cc: linux-kernel , "K.R. Foley" , Rui Nuno Capela , Joel White In-Reply-To: <1096768900.1375.26.camel@krustophenia.net> References: <1094683020.1362.219.camel@krustophenia.net> <20040909061729.GH1362@elte.hu> <20040919122618.GA24982@elte.hu> <414F8CFB.3030901@cybsft.com> <20040921071854.GA7604@elte.hu> <20040921074426.GA10477@elte.hu> <20040922103340.GA9683@elte.hu> <20040923122838.GA9252@elte.hu> <20040923211206.GA2366@elte.hu> <20040924074416.GA17924@elte.hu> <20040928000516.GA3096@elte.hu> <1096768900.1375.26.camel@krustophenia.net> Content-Type: text/plain Message-Id: <1096769650.1375.34.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sat, 02 Oct 2004 22:14:10 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 868 Lines: 22 On Sat, 2004-10-02 at 22:01, Lee Revell wrote: > On Mon, 2004-09-27 at 20:05, Ingo Molnar wrote: > > i've released the -S7 VP patch: > > > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc2-mm4-S7 > > > > I believe we have found a bug. A user reported massive xruns with S7, > they turned out to be printk() overhead from tons of "using > smp_processor_id() in preemptible code" errors. The trace below repeats > over and over. Looks like raid0 is the problem. The exact configuration is 4 SCSI drives in a raid 0, and a single IDE drive. The raid0 code apparently is not preempt safe. Lee - 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/