From owner-freebsd-stable@FreeBSD.ORG  Wed Sep  6 20:33:47 2006
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 78FE816A4DD
	for <freebsd-stable@freebsd.org>; Wed,  6 Sep 2006 20:33:47 +0000 (UTC)
	(envelope-from freebsd-stable@m.gmane.org)
Received: from ciao.gmane.org (main.gmane.org [80.91.229.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 6CA1B43D7B
	for <freebsd-stable@freebsd.org>; Wed,  6 Sep 2006 20:33:38 +0000 (GMT)
	(envelope-from freebsd-stable@m.gmane.org)
Received: from list by ciao.gmane.org with local (Exim 4.43)
	id 1GL45F-0008Fd-BC
	for freebsd-stable@freebsd.org; Wed, 06 Sep 2006 22:33:17 +0200
Received: from cmung9.cmu.carnet.hr ([193.198.128.9])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-stable@freebsd.org>; Wed, 06 Sep 2006 22:33:17 +0200
Received: from ivoras by cmung9.cmu.carnet.hr with local (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-stable@freebsd.org>; Wed, 06 Sep 2006 22:33:17 +0200
X-Injected-Via-Gmane: http://gmane.org/
To: freebsd-stable@freebsd.org
From: Ivan Voras <ivoras@fer.hr>
Date: Wed, 06 Sep 2006 22:33:05 +0200
Lines: 12
Message-ID: <ednb9p$3ap$1@sea.gmane.org>
References: <1D6A7B88-79F5-4014-9E49-5AD4FFC6AE00@nevada.net.nz>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
X-Complaints-To: usenet@sea.gmane.org
X-Gmane-NNTP-Posting-Host: cmung9.cmu.carnet.hr
User-Agent: Thunderbird 1.5.0.5 (Windows/20060719)
In-Reply-To: <1D6A7B88-79F5-4014-9E49-5AD4FFC6AE00@nevada.net.nz>
Sender: news <news@sea.gmane.org>
Subject: Re: Slow/locking UFS/VFS in 6.1?
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: Wed, 06 Sep 2006 20:33:47 -0000

Philip Murray wrote:

> When this happens it seems a lot of Apache processes get stuck in the
> UFS state (in top).

I've seen this when there's a huge directory involved, such as created
by a runaway web cache function, PHP sessions, or "PHP accelerator" that
creates a lot of small cache files. If so, you'll probably need to
delete that directory completely and make sure it doesn't happen again
(e.g. use a multi-stage directory tree instead of a big one).

You might have luck with increasing dirhash size (vfs.ufs.dirhash_maxmem).