Date: Tue, 22 Feb 2011 03:17:29 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Bruce Cran <bruce@cran.org.uk> Cc: Greg Bonett <greg@bonett.org>, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: 8.1 amd64 lockup (maybe zfs or disk related) Message-ID: <20110222111729.GA193@icarus.home.lan> In-Reply-To: <1298372700.4940.76.camel@debian.nessbank> References: <1297026074.23922.8.camel@ubuntu> <20110207045501.GA15568@icarus.home.lan> <1297065041.754.12.camel@ubuntu> <20110207085537.GA20545@icarus.home.lan> <1298372700.4940.76.camel@debian.nessbank>
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On Tue, Feb 22, 2011 at 11:05:00AM +0000, Bruce Cran wrote: > On Mon, 2011-02-07 at 00:55 -0800, Jeremy Chadwick wrote: > > > # NOTE: Systems with 8GB of RAM or more have prefetch enabled by default. > > vfs.zfs.prefetch_disable="1" > > I think ZFS is enabled with 4 GB or more, not 8 GB: > > "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." The message ZFS on FreeBSD spits out (shown above) is somewhat inaccurate. I spent the time looking at the code and blogged about the condition over a year ago: http://koitsu.wordpress.com/2009/10/12/testing-out-freebsd-8-0-rc1/ Search for "ZFS NOTICE: system has less than 4GB" on the page above. I still feel the message needs to be re-worded, despite having gone through multiple changes of phrasing already. -- | 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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