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Date: Mon, 28 Apr 2008 10:45:11 +0200
From: "Ivan Voras" <ivoras@freebsd.org>
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To: "Jeremy Chadwick" <koitsu@freebsd.org>
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Cc: Randy Bush <randy@psg.com>, freebsd-fs@freebsd.org
Subject: Re: zfs and vfs.zfs.prefetch_disable="1"
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2008/4/28 Jeremy Chadwick <koitsu@freebsd.org>:
> On Sun, Apr 27, 2008 at 04:26:54PM +0900, Randy Bush wrote:
>  > i have in my incantations for zfs on i386 to stick the following in
>  > /boot/loader.conf.local
>  >
>  > vm.kmem_size=600M
>  > vm.kmem_size_max=600M
>  > zfs_load=YES
>  > vfs.zfs.prefetch_disable=1
>  >
>  > but i have no idea where that last one crept in.  any clues?
>
>  It probably came from the old version of the "ZFS Tuning Guide" section
>  of the ZFS on FreeBSD Wiki.  It was removed on August 30th 2007 by Ivan
>  Voras.
>
>  http://wiki.freebsd.org/ZFSTuningGuide?action=diff&rev2=12&rev1=11
>  http://wiki.freebsd.org/ZFSTuningGuide?action=recall&rev=12
>  http://wiki.freebsd.org/ZFSTuningGuide?action=recall&rev=11
>
>  I've CC'd him here.

The change you reference is apparently about zil_disable, which wasn't
removed, just moved. But the prefetch_disable setting was added and
removed a couple of times to the page, the latest being that it was
added since Pawel uses it in his post.