From owner-freebsd-stable@FreeBSD.ORG  Tue Feb 22 11:05:05 2011
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
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 95E711065674
	for <freebsd-stable@freebsd.org>; Tue, 22 Feb 2011 11:05:05 +0000 (UTC)
	(envelope-from bruce@cran.org.uk)
Received: from muon.cran.org.uk (unknown [IPv6:2a01:348:0:15:5d59:5c40:0:1])
	by mx1.freebsd.org (Postfix) with ESMTP id 1CA738FC17
	for <freebsd-stable@freebsd.org>; Tue, 22 Feb 2011 11:05:05 +0000 (UTC)
Received: from muon.cran.org.uk (localhost [127.0.0.1])
	by muon.cran.org.uk (Postfix) with ESMTP id 44505E82E3;
	Tue, 22 Feb 2011 11:05:02 +0000 (GMT)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cran.org.uk; h=subject
	:from:to:cc:in-reply-to:references:content-type:date:message-id
	:mime-version:content-transfer-encoding; s=mail; bh=4XlyoFLNCi6h
	F7SahDeV1v7dgxM=; b=O/l/eu8gwMm3ph1cvETD4hyrt72YJelqkvLEBOMgsIAB
	G4cFvGOFTCp0e+nXBs+2TSsUSx9UWbuNaxPnUoVwe47l6fzA0UH8PbUfLiM8pQb5
	cbknGUx+oLi2xPQIdNyPgdWq4u1Q3HVya/9IvONr30q520paOxR5qGsv3HimdcU=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=cran.org.uk; h=subject:from
	:to:cc:in-reply-to:references:content-type:date:message-id
	:mime-version:content-transfer-encoding; q=dns; s=mail; b=TyL5Mn
	y28Y0MIt6c4r/JgythFlMd8XjdVBCqigpakePaKTMvhTNRJykAWw0sZxzRTe6GiR
	6pQ5I41W/5QE6E1HRjLemzdAXNAsLwZa4TwyG2YlTkq8CA4ffrpwhZIr/DGQRDzg
	+1rYOdEPf1rM9PRj2yXZlgJOpqdbetvmXQll0=
Received: from [192.168.0.11] (client-86-31-177-138.oxfd.adsl.virginmedia.com
	[86.31.177.138])
	(using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
	(No client certificate requested)
	by muon.cran.org.uk (Postfix) with ESMTPSA id E0B88E61C0;
	Tue, 22 Feb 2011 11:05:01 +0000 (GMT)
From: Bruce Cran <bruce@cran.org.uk>
To: Jeremy Chadwick <freebsd@jdc.parodius.com>
In-Reply-To: <20110207085537.GA20545@icarus.home.lan>
References: <1297026074.23922.8.camel@ubuntu>
	<20110207045501.GA15568@icarus.home.lan>
	<1297065041.754.12.camel@ubuntu>
	<20110207085537.GA20545@icarus.home.lan>
Content-Type: text/plain; charset="UTF-8"
Date: Tue, 22 Feb 2011 11:05:00 +0000
Message-ID: <1298372700.4940.76.camel@debian.nessbank>
Mime-Version: 1.0
X-Mailer: Evolution 2.30.3 
Content-Transfer-Encoding: 7bit
Cc: Greg Bonett <greg@bonett.org>, freebsd-stable <freebsd-stable@freebsd.org>
Subject: Re: 8.1 amd64 lockup (maybe zfs or disk related)
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 22 Feb 2011 11:05:05 -0000

On Mon, 2011-02-07 at 00:55 -0800, Jeremy Chadwick wrote:

> # NOTE: Systems with 8GB of RAM or more have prefetch enabled by default.
> vfs.zfs.prefetch_disable="1"

I think ZFS is enabled with 4 GB or more, not 8 GB:

"ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is
present; to enable, add "vfs.zfs.prefetch_disable=0"
to /boot/loader.conf."

-- 
Bruce Cran