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Date: Tue, 27 Feb 2007 16:28:44 -0500
From: Kris Kennaway <kris@obsecurity.org>
To: Mikhail Teterin <mi+kde@aldan.algebra.com>
Message-ID: <20070227212844.GA57256@xor.obsecurity.org>
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Cc: stable@freebsd.org, Alex Kozlov <spam@rm-rf.kiev.ua>,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: panic: kmem_malloc(16384): kmem_map too small: md-mounted /tmp
	filled up
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On Tue, Feb 27, 2007 at 04:24:21PM -0500, Mikhail Teterin wrote:
> On Tuesday 27 February 2007 16:09, Kris Kennaway wrote:
> =3D Documented in the manpage, use swap backing or reserve enough space.
> =3D=20
> =3D Kris
>=20
> The strings "panic" and "-o reserve" are mentioned in neither mdmfs(8) no=
r in=20
> rc.conf(5)... Is one supposed to look elsewhere?

Yes, mdconfig, which is what creates the device (mdmfs is a legacy
wrapper for 4.x compatibility).

> Worse, the use of malloc-based mds is touted in rc.conf as something, tha=
t is=20
> supposed to help "system stability at low memory conditions".
>=20
> All I did on this system, was set=20
>=20
> 	tmpmfs=3D"YES"
> 	tmpsize=3D"2048m"
>=20
> in the /etc/rc.conf.
>=20
> Alex has already said, that using malloc-backed md is a bad default -- do=
 you=20
> disagree?

No, that's what I said too (on this occasion and several times in the
past :).

I am not aware of a good reason to use malloc backing over swap, under
any circumstances.

Kris

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