From owner-freebsd-stable@FreeBSD.ORG Wed Mar 3 11:09:03 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6F7FC1065670 for ; Wed, 3 Mar 2010 11:09:03 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from qmta06.emeryville.ca.mail.comcast.net (qmta06.emeryville.ca.mail.comcast.net [76.96.30.56]) by mx1.freebsd.org (Postfix) with ESMTP id 529308FC14 for ; Wed, 3 Mar 2010 11:09:03 +0000 (UTC) Received: from omta20.emeryville.ca.mail.comcast.net ([76.96.30.87]) by qmta06.emeryville.ca.mail.comcast.net with comcast id ob7k1d0021smiN4A6b93xM; Wed, 03 Mar 2010 11:09:03 +0000 Received: from koitsu.dyndns.org ([98.248.46.159]) by omta20.emeryville.ca.mail.comcast.net with comcast id ob921d00E3S48mS8gb9360; Wed, 03 Mar 2010 11:09:03 +0000 Received: by icarus.home.lan (Postfix, from userid 1000) id A03551E3035; Wed, 3 Mar 2010 03:09:01 -0800 (PST) Date: Wed, 3 Mar 2010 03:09:01 -0800 From: Jeremy Chadwick To: Ruben de Groot , "C. P. Ghost" , freebsd-stable@freebsd.org Message-ID: <20100303110901.GB51588@icarus.home.lan> References: <20100301203450.GA99170@ei.bzerk.org> <20100301211441.GB99170@ei.bzerk.org> <20100302084347.GA4719@ei.bzerk.org> <20100302171227.GA26933@ei.bzerk.org> <20100302173632.GA29314@icarus.home.lan> <20100303080956.GA32493@ei.bzerk.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100303080956.GA32493@ei.bzerk.org> User-Agent: Mutt/1.5.20 (2009-06-14) Cc: Subject: Re: stable-8 regression: time stands still X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Mar 2010 11:09:03 -0000 On Wed, Mar 03, 2010 at 09:09:56AM +0100, Ruben de Groot wrote: > > > I'm going to get this kern.timecounter sysctl from the system booted with a 7.x livecd > > > this evening. But really, I think this is a regression. Even if this system is the only > > > one known to be affected (which I sincerely doubt). > > > > You can force a timecounter choice by setting it in /boot/loader.conf. > > I would recommend choosing ACPI-safe on your system to see if that > > improves things: > > > > kern.timecounter.hardware=ACPI-safe > > Thanks, that solved my issue. Allthough for correctness I must add that this line > must be put in /etc/sysctl.conf; it does nothing in loader.conf. > Also the sysctl can be run in multiuser and immediately fixed the problem. Ah, I thought it was a loader tunable, not a sysctl tunable. My apologies! Yes, sysctl.conf is the correct place for this. > One question remains: why did this suddenly become a problem in FreeBSD 8 and not > in FreeBSD 7. That would be a question for the people who decided upon the timecounter priorities in FreeBSD, since they're hard-coded (meaning: why HPET is chosen above ACPI-safe). This may have changed between RELENG_7 and RELENG_8; I simply don't know. It would be easy to verify on your system of course (just boot a FreeBSD 7 LiveCD and provide the output from sysctl kern.timecounter). -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |