From owner-freebsd-current@FreeBSD.ORG Fri Jul 16 03:18:16 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4B35916A4CE for ; Fri, 16 Jul 2004 03:18:16 +0000 (GMT) Received: from smtp003.bizmail.yahoo.com (smtp003.bizmail.yahoo.com [216.136.130.195]) by mx1.FreeBSD.org (Postfix) with SMTP id 34B5F43D2F for ; Fri, 16 Jul 2004 03:18:16 +0000 (GMT) (envelope-from noackjr@alumni.rice.edu) Received: from unknown (HELO optimator.noacks.org) (noackjr@supercrime.org@70.240.197.108 with login) by smtp003.bizmail.yahoo.com with SMTP; 16 Jul 2004 03:18:15 -0000 Received: from localhost (localhost [127.0.0.1]) by optimator.noacks.org (Postfix) with ESMTP id 56A6B61F5; Thu, 15 Jul 2004 22:18:15 -0500 (CDT) Received: from optimator.noacks.org ([127.0.0.1]) by localhost (optimator.noacks.org [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 38384-05; Thu, 15 Jul 2004 22:18:14 -0500 (CDT) Received: from compgeek.noacks.org (compgeek [192.168.1.10]) by optimator.noacks.org (Postfix) with ESMTP id 4C72861EF; Thu, 15 Jul 2004 22:18:14 -0500 (CDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by compgeek.noacks.org (8.12.11/8.12.11) with ESMTP id i6G3IBtA006481; Thu, 15 Jul 2004 22:18:14 -0500 (CDT) (envelope-from noackjr@alumni.rice.edu) Message-ID: <40F748F3.6020702@alumni.rice.edu> Date: Thu, 15 Jul 2004 22:18:11 -0500 From: Jon Noack User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040629) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Sean McNeil References: <1089924060.1074.7.camel@server.mcneil.com> In-Reply-To: <1089924060.1074.7.camel@server.mcneil.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at noacks.org cc: freebsd-current@freebsd.org Subject: Re: consistent hard lockup with recent kernels X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: noackjr@alumni.rice.edu List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Jul 2004 03:18:16 -0000 On 07/15/04 15:41, Sean McNeil wrote: > I get a very repeatable hard freeze of the system when I use firefox and > attempt to download a large iso image. I've been trying to get a livecd > image from a gentoo.org mirror (needed for something else, I'm a FreeBSD > fan, honest!!) ;) > > I suppose this is related to the preemption issues, but don't have > anything to show for it except my dmegs. I can't access the system at > all to see why it is happening. Yeah, it is most likely bugs uncovered by native preemption. For now you can remask then by commenting out the "#define PREEMPTION" in src/sys//include/param.h and rebuilding your kernel. Robert Watson's comments on this: "This results in a quite usable kernel, although quite probably more poor interrupt handling latency, etc." You'll see the following warning on boot: WARNING: Kernel preemption is disabled, expect reduced performance. An example of this reduced performance is sound issues (slowdowns, pops, etc.) when the system is under load (most notably with disk load). Jon