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From: "Oldach, Helge" <Helge.Oldach@atosorigin.com>
To: Mike Harding <mvh@ix.netcom.com>,
	The Hermit Hacker <scrappy@hub.org>
Date: Mon, 26 May 2003 09:50:38 +0200
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cc: stable@freebsd.org
Subject: RE: system slowdown - vnode related
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From: Mike Harding [mailto:mvh@ix.netcom.com]
> I'm running a very recent RELENG-4 - but I had a suspicion 
> that this was
> unionfs related, so I unmounted the /usr/ports union mounts 
> under a jail
> in case this was causing the problem, and haven't seen the problem
> since.

Probably you don't want to use unionfs but nullfs, mount /usr/ports readonly
to the jail, and use a jail-writeable directory for port building. I
personally use

WRKDIRPREFIX=/usr/obj
WRKDIR=${WRKDIRPREFIX}${.CURDIR}

in /etc/make.conf.

This setup has been working for years for me without problems.

Helge