From owner-freebsd-current@FreeBSD.ORG  Wed Apr 23 05:14:15 2008
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 6E4D4106566B
	for <freebsd-current@FreeBSD.org>; Wed, 23 Apr 2008 05:14:15 +0000 (UTC)
	(envelope-from daichi@freebsd.org)
Received: from natial.ongs.co.jp (natial.ongs.co.jp [202.216.246.90])
	by mx1.freebsd.org (Postfix) with ESMTP id 583508FC0A
	for <freebsd-current@FreeBSD.org>; Wed, 23 Apr 2008 05:14:15 +0000 (UTC)
	(envelope-from daichi@freebsd.org)
Received: from parancell.ongs.co.jp (dullmdaler.ongs.co.jp [202.216.246.94])
	by natial.ongs.co.jp (Postfix) with ESMTP id 2B2AF125438;
	Wed, 23 Apr 2008 14:14:13 +0900 (JST)
Message-ID: <480EC5A5.8030308@freebsd.org>
Date: Wed, 23 Apr 2008 14:14:13 +0900
From: Daichi GOTO <daichi@freebsd.org>
User-Agent: Thunderbird 2.0.0.12 (X11/20080422)
MIME-Version: 1.0
To: Jeremie Le Hen <jeremie@le-hen.org>
References: <20080422203435.GA92168@obiwan.tataz.chchile.org>
	<20080422210851.GE92168@obiwan.tataz.chchile.org>
In-Reply-To: <20080422210851.GE92168@obiwan.tataz.chchile.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-current@FreeBSD.org, Masanori OZAWA <ozawa@ongs.co.jp>
Subject: Re: unionfs makes -CURRENT very sluggish
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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: Wed, 23 Apr 2008 05:14:15 -0000

Jeremie Le Hen wrote:
> Hi,
> 
> On Tue, Apr 22, 2008 at 10:34:35PM +0200, Jeremie Le Hen wrote:
>> I tried to compile lib/ncurses through unionfs.  It is utterly slow, no
>> matter I mount with noatime or not.
>>
>> Relevant mounts:
>> % /usr/src on /space/chroot/usr/src (nullfs, local, read-only)
>> % <above>:/space/chroot/usr/src.union on /space/chroot/usr/src (unionfs, local)
>>
>> % root:~# chroot /space/chroot
>> % root:/# cd /usr/src/
>> % root:/# make buildenv
>> % # cd lib/ncurses
>> % # time make
>>
>> Compile time without noatime:
>>      5089.47 real      1670.72 user      3364.89 sys
>>
>> Compile time with noatime:
>>      5083.22 real      1664.10 user      3369.22 sys
>>
>> Now if I remove the unionfs mount and just use nullfs:
>>       255.47 real       150.51 user        83.82 sys
>>
>>
>> As you can see, most of the time is spent in kernel.  I'm recompiling my
>> kernel with hwpmc right now in order to profile it.  Any other debug
>> hint would be welcome.
>>
>> FWIW, "while sleep 1 ; do date ; done" runs jerkily when unionfs is run:
>> Tue Apr 22 21:20:06 CEST 2008
>> Tue Apr 22 21:20:13 CEST 2008
>> Tue Apr 22 21:20:17 CEST 2008
>> Tue Apr 22 21:20:22 CEST 2008
>> Tue Apr 22 21:20:29 CEST 2008
>>
>> Whereas it runs smoothly without unionfs.
>>
>> I'll give the result of hwpmc ASAP.
> 
> I've upgraded to the latest -CURRENT and the problem went away.  Sorry
> for the noise.
> 
> Regards,

No problem :)  Thanks for your report!

-- 
   Daichi GOTO, http://people.freebsd.org/~daichi