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Date:      Mon, 9 Apr 2007 21:11:25 -0400
From:      Kris Kennaway <kris@obsecurity.org>
To:        Craig Boston <craig@xfoil.gank.org>, freebsd-current@FreeBSD.org, Pawel Jakub Dawidek <pjd@FreeBSD.org>, freebsd-fs@FreeBSD.org
Subject:   Re: ZFS committed to the FreeBSD base.
Message-ID:  <20070410011125.GB38535@xor.obsecurity.org>
In-Reply-To: <20070410003837.GB8189@nowhere>
References:  <20070406025700.GB98545@garage.freebsd.pl> <20070407025644.GC8831@cicely12.cicely.de> <20070407131353.GE63916@garage.freebsd.pl> <4617A3A6.60804@kasimir.com> <20070407165759.GG8831@cicely12.cicely.de> <20070407180319.GH8831@cicely12.cicely.de> <20070407191517.GN63916@garage.freebsd.pl> <20070407212413.GK8831@cicely12.cicely.de> <20070410003505.GA8189@nowhere> <20070410003837.GB8189@nowhere>

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On Mon, Apr 09, 2007 at 07:38:37PM -0500, Craig Boston wrote:
> On Mon, Apr 09, 2007 at 07:35:05PM -0500, Craig Boston wrote:
> > 512MB RAM.  So I've been testing in a VMware instance with 512MB.  My
> > vm.kmem_size is defaulting to 169758720.
>=20
> Meh, wrong stat, I probably should have said that
>=20
> vm.kmem_size_max: 335544320

Nah, you were right the first time :) Your system is defaulting to
160MB for the kmem_map, of which zfs will (by default) try to use up
to 3/4.  Naturally this doesn't leave much for the rest of the kernel
(40MB), so you'll easily run the kernel out of memory.

For now, you probably want to increase vm.kmem_size a bit to allow
some more room for zfs, and set vfs.zfs.arc_max and arc_min to
something more reasonable like 64*1024*1024+1 (the +1 is needed
because zfs currently requires "greater than 64MB" for the arc).

Kris

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