From owner-freebsd-questions@FreeBSD.ORG  Thu Aug 23 11:58:05 2012
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 79E1A106566C
	for <freebsd-questions@freebsd.org>;
	Thu, 23 Aug 2012 11:58:05 +0000 (UTC)
	(envelope-from rwmaillists@googlemail.com)
Received: from mail-ey0-f182.google.com (mail-ey0-f182.google.com
	[209.85.215.182])
	by mx1.freebsd.org (Postfix) with ESMTP id F301C8FC0A
	for <freebsd-questions@freebsd.org>;
	Thu, 23 Aug 2012 11:58:04 +0000 (UTC)
Received: by eaak11 with SMTP id k11so218889eaa.13
	for <freebsd-questions@freebsd.org>;
	Thu, 23 Aug 2012 04:57:58 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=googlemail.com; s=20120113;
	h=date:from:to:subject:message-id:in-reply-to:references:x-mailer
	:mime-version:content-type:content-transfer-encoding;
	bh=oPSi/CXL5UN5uxaCZVnWQK0bX3eQDSH76mmAniS8ka8=;
	b=0I9V5EVJs2LUkuzMzjlcCT41oZeAbpPKhAtMO1OlmBXYN30NajgLeOLEgTd92RWlKE
	tI7QFUgL3cMOz8HF6O0EWwB1M7lbMzGwNmrYWdcHeGIgB8z8Uz9uiqUZDBzZlZeJ+kRy
	PXtS2MgboHDxlS/xlYC16id7xiFoX79H+eou6NrVuipfDzywOydN1bjThfHlxvaOVX0J
	wtVDfJu7mtYn0ffqyfgmvpNim9J54cx0/Y7Npqzsl5qbFPnK+YI5kZxJ0K1/cXcH0306
	R6zZDX45h6XQgrIm57bEoPM6OBrOBiNCsz26kCck194SFAfgMGk/FPsdKial7lJ0C5Kd
	WEKA==
Received: by 10.14.206.200 with SMTP id l48mr1555090eeo.41.1345723078585;
	Thu, 23 Aug 2012 04:57:58 -0700 (PDT)
Received: from gumby.homeunix.com (87-194-105-247.bethere.co.uk.
	[87.194.105.247])
	by mx.google.com with ESMTPS id k49sm20898462een.4.2012.08.23.04.57.56
	(version=SSLv3 cipher=OTHER); Thu, 23 Aug 2012 04:57:57 -0700 (PDT)
Date: Thu, 23 Aug 2012 12:57:54 +0100
From: RW <rwmaillists@googlemail.com>
To: freebsd-questions@freebsd.org
Message-ID: <20120823125754.53f9f545@gumby.homeunix.com>
In-Reply-To: <CAHu1Y72OdQqxEeehj_ST1pCa4_3QPiT3PqNej4m-psn22bEu2w@mail.gmail.com>
References: <201208221934.q7MJYfwM063804@mail.r-bonomi.com>
	<1345664911.2501.8.camel@z6000.lenzicasa>
	<CAHu1Y72xwNevgKQ8eVYYOzGC80-511DtDe8kJMWbYJm5Tq28CA@mail.gmail.com>
	<20120822232112.07ac3517@gumby.homeunix.com>
	<20120822232907.34fc82fc@gumby.homeunix.com>
	<CAHu1Y71Y_cxv_qgQaMmzdx5kZHtXGuLGaxx9QQAE8QBWGL3fUA@mail.gmail.com>
	<20120823031754.0b52bed6@gumby.homeunix.com>
	<CAHu1Y72OdQqxEeehj_ST1pCa4_3QPiT3PqNej4m-psn22bEu2w@mail.gmail.com>
X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.6; amd64-portbld-freebsd8.3)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: /tmp filesystem full
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 23 Aug 2012 11:58:05 -0000

On Wed, 22 Aug 2012 21:24:47 -0700
Michael Sierchio wrote:

> On Wed, Aug 22, 2012 at 7:17 PM, RW <rwmaillists@googlemail.com>
> wrote:
> 
> >  tmpfs and "swap" md devices don't actually need swap. I don't seen
> > any advantage in your way of creating an md device for /tmp.
> 
> Then you don't understand. ;-)  The advantage of my approach is
> avoiding a kernel panic when writing to the tmpfs 

md device

> when you haven't
> pre-allocated all the filesystem space at creation time.  If that
> happens to matter to you...

It's the other way around, "malloc" md devices can cause kernel
panics.  "swap" md device use ordinary VM memory. If you set the limit
too high without swap you can slow performance, but it shouldn't
cause a kernel panic.

The default of 2MB isn't going to make a significant difference on any
normal install.