From owner-freebsd-fs@FreeBSD.ORG  Mon Feb 28 20:48:57 2011
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Date: Mon, 28 Feb 2011 21:48:47 +0100
From: Alexander Leidinger <Alexander@Leidinger.net>
To: Fabian Keil <freebsd-listen@fabiankeil.de>
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Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org,
	Pawel Jakub Dawidek <pjd@FreeBSD.org>
Subject: Re: HEADS UP: ZFSv28 is in!
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On Mon, 28 Feb 2011 19:21:29 +0100 Fabian Keil
<freebsd-listen@fabiankeil.de> wrote:

> Pawel Jakub Dawidek <pjd@FreeBSD.org> wrote:
> 
> > I just committed ZFSv28 to HEAD.
> 
> I updated the system without removing the tuning for ZFSv15
> first, and somehow this completely messed up the performance.
> Booting the system took more than ten minutes and even once
> it was up it was next to unresponsive.
> 
> I'm not sure which sysctl was to blame, but after removing
> all but vfs.zfs.arc_max="800M" and rebooting, the problem
> was gone.

When you add the tuning back, does it take minutes again to boot? If
not, I assume it was cleaning up some leftovers the old version was not
able to cleanup.

Bye,
Alexander.