From owner-freebsd-current@FreeBSD.ORG Sun May 28 22:29:10 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org 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 0F14516A433; Sun, 28 May 2006 22:12:01 +0000 (UTC) (envelope-from oberman@es.net) Received: from postal2.es.net (postal2.es.net [198.128.3.206]) by mx1.FreeBSD.org (Postfix) with ESMTP id C962143D5D; Sun, 28 May 2006 22:12:00 +0000 (GMT) (envelope-from oberman@es.net) Received: from ptavv.es.net ([198.128.4.29]) by postal2.es.net (Postal Node 2) with ESMTP (SSL) id IBA74465; Sun, 28 May 2006 15:11:54 -0700 Received: from ptavv.es.net (localhost [127.0.0.1]) by ptavv.es.net (Tachyon Server) with ESMTP id 7351845043; Sun, 28 May 2006 15:11:54 -0700 (PDT) To: Yar Tikhiy In-reply-to: Your message of "Sun, 28 May 2006 18:20:39 +0400." <20060528142039.GA80613@comp.chem.msu.su> Date: Sun, 28 May 2006 15:11:54 -0700 From: "Kevin Oberman" Message-Id: <20060528221154.7351845043@ptavv.es.net> Cc: njl@freebsd.org, freebsd-current@freebsd.org Subject: Re: Freeze due to performance_cx_lowest=LOW X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 May 2006 22:29:16 -0000 > Date: Sun, 28 May 2006 18:20:39 +0400 > From: Yar Tikhiy > Sender: owner-freebsd-current@freebsd.org > > Hi, > > A while ago I installed CURRENT on my new home PC and noticed that > the system would hang hard at the boot time soon after setting > cx_lowest to C3 according to the LOW setting in /etc/defaults/rc.conf. > The last message on the console was each time: Mounting NFS file > systems:. Setting performance_cx_lowest to HIGH made the problem > go away. > > Now I've just tried again to return performance_cx_lowest to its > modern default setting in a fresh CURRENT and found that the bug > is still there. Is it due to my ACPI HW being broken? I'll be > glad to show relevant debug output from my ACPI if told how to get > it. Thanks. This problem has been discussed over on ACPI. It's a problem with the local APIC timer which does not run in C3 or lower. Nate is looking at a solution for the problem. See his message on acpi@ on Sun, 07 May 2006 15:28:29 -0700. The fixes are to either not use C3 (or C4 if it's available) or to disable APIC. For those who are not reading closely, DO NOT confuse APIC with ACPI! They only look similar. If the system is UP, there is no really no need for APIC. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634