From owner-freebsd-current@FreeBSD.ORG  Fri Sep  3 21:16:21 2004
Return-Path: <owner-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 03D0316A4CE
	for <freebsd-current@freebsd.org>;
	Fri,  3 Sep 2004 21:16:21 +0000 (GMT)
Received: from kane.otenet.gr (kane.otenet.gr [195.170.0.27])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 44BF643D31
	for <freebsd-current@freebsd.org>;
	Fri,  3 Sep 2004 21:16:20 +0000 (GMT)
	(envelope-from keramida@linux.gr)
Received: from gothmog.gr (patr530-a048.otenet.gr [212.205.215.48])
	i83LGHCd024666;	Sat, 4 Sep 2004 00:16:18 +0300
Received: from gothmog.gr (gothmog [127.0.0.1])
	by gothmog.gr (8.13.1/8.13.1) with ESMTP id i83LESGf014171;
	Sat, 4 Sep 2004 00:14:28 +0300 (EEST)
	(envelope-from keramida@linux.gr)
Received: (from giorgos@localhost)
	by gothmog.gr (8.13.1/8.13.1/Submit) id i83LES6I014170;
	Sat, 4 Sep 2004 00:14:28 +0300 (EEST)
	(envelope-from keramida@linux.gr)
Date: Sat, 4 Sep 2004 00:14:28 +0300
From: Giorgos Keramidas <keramida@linux.gr>
To: "Marc G. Fournier" <scrappy@hub.org>
Message-ID: <20040903211427.GB1199@gothmog.gr>
References: <20040903175434.A812@ganymede.hub.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20040903175434.A812@ganymede.hub.org>
Phone: +30-2610-312145
Mobile: +30-6944-116520
cc: freebsd-current@freebsd.org
Subject: Re: what is fsck's "slowdown"?
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 03 Sep 2004 21:16:21 -0000

On 2004-09-03 18:01, "Marc G. Fournier" <scrappy@hub.org> wrote:
>
> load: 0.99  cmd: fsck 67 [running] 15192.26u 142.30s 99% 184284k
> /dev/da0s1h: phase 4: cyl group 408 of 866 (47%)
>
> wouldn't it be possible, on a dual CPU system, to have group 434 and above
> run on one process, while group 433 and below running on the second, in
> parallel?  Its not like the drives are being beat up:

My intuition says that if metadata of the first part of the disk references
data residing on the second part synchronization and locking would probably
be a bit difficult; actually very difficult.