Date: Mon, 15 Mar 2010 22:11:48 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Dan Naumov <dan.naumov@gmail.com> Cc: freebsd-fs@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Some questions about vfs.zfs.prefetch_disable=1 and ZFS filesystem versions Message-ID: <20100316051148.GA73270@icarus.home.lan> In-Reply-To: <cf9b1ee01003151640u57b99e23rd0045ba57b82f94d@mail.gmail.com> References: <cf9b1ee01003151640u57b99e23rd0045ba57b82f94d@mail.gmail.com>
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On Tue, Mar 16, 2010 at 01:40:25AM +0200, Dan Naumov wrote: > After looking at the arc_summary.pl script (found at > http://jhell.googlecode.com/files/arc_summary.pl), I have realized > that my system has set vfs.zfs.prefetch_disable=1 by default, looking > at dmesg, I see: > > ========================= > ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present; > to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf. > ========================= > > ...except I do have 4gb of RAM. Is this caused by integrated GPU > snatching some of my memory at boot? From dmesg: > > ========================= > real memory = 4294967296 (4096 MB) > avail memory = 4088082432 (3898 MB) > ========================= I've blogged about this problem when testing out 8.0-RC1. See the bottom third of my post for an explanation: http://koitsu.wordpress.com/2009/10/12/testing-out-freebsd-8-0-rc1/ The message is confusing/badly worded, despite having gone through numerous commits to change its wording. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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