8.1 amd64 lockup (maybe zfs or disk related)

Jeremy Chadwick freebsd at jdc.parodius.com
Tue Feb 22 11:17:32 UTC 2011

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:


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 at 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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