From owner-freebsd-current@FreeBSD.ORG  Sun Nov 21 23:35:10 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 14610106566B
	for <freebsd-current@freebsd.org>; Sun, 21 Nov 2010 23:35:10 +0000 (UTC)
	(envelope-from freebsd-current@m.gmane.org)
Received: from lo.gmane.org (lo.gmane.org [80.91.229.12])
	by mx1.freebsd.org (Postfix) with ESMTP id BB82C8FC17
	for <freebsd-current@freebsd.org>; Sun, 21 Nov 2010 23:35:09 +0000 (UTC)
Received: from list by lo.gmane.org with local (Exim 4.69)
	(envelope-from <freebsd-current@m.gmane.org>) id 1PKJR6-0003pc-Lr
	for freebsd-current@freebsd.org; Mon, 22 Nov 2010 00:35:08 +0100
Received: from cpe-188-129-98-75.dynamic.amis.hr ([188.129.98.75])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-current@freebsd.org>; Mon, 22 Nov 2010 00:35:08 +0100
Received: from ivoras by cpe-188-129-98-75.dynamic.amis.hr with local (Gmexim
	0.1 (Debian)) id 1AlnuQ-0007hv-00
	for <freebsd-current@freebsd.org>; Mon, 22 Nov 2010 00:35:08 +0100
X-Injected-Via-Gmane: http://gmane.org/
To: freebsd-current@freebsd.org
From: Ivan Voras <ivoras@freebsd.org>
Date: Mon, 22 Nov 2010 00:34:53 +0100
Lines: 14
Message-ID: <iccaau$c3s$1@dough.gmane.org>
References: <icc2ih$e5t$1@dough.gmane.org>	<AANLkTi=Aw3KQqeDy1Bxn7tJrsvOn-D=y-ChCOpVu4E8N@mail.gmail.com>	<20101121214720.356984cc@core.draftnet>	<AANLkTimaKY0t4mGtsncSC9dV5SkUdfE+MWY5=4F=Xi7X@mail.gmail.com>	<AANLkTin1QBZF6KnryEe13-rAk+BJOw6uUbyyWq1ef3Co@mail.gmail.com>	<icc77q$mo$1@dough.gmane.org>
	<AANLkTi=aUKiJvLToM6PX0Nsc-tEtNZdzHgWAsJNVr-2T@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: usenet@dough.gmane.org
X-Gmane-NNTP-Posting-Host: cpe-188-129-98-75.dynamic.amis.hr
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.2.12) Gecko/20101102 Thunderbird/3.1.6
In-Reply-To: <AANLkTi=aUKiJvLToM6PX0Nsc-tEtNZdzHgWAsJNVr-2T@mail.gmail.com>
Subject: Re: tmpfs out of space (ZFS related?)
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 21 Nov 2010 23:35:10 -0000

On 11/22/10 00:28, Paul B Mahol wrote:

> Find way to reproduce it 100%.

The way I described it can be used to reproduce the problem 100%. 
Detailed instructions for a test case would be something like this:

0) configure a system with tmpfs for /tmp
1) install PostgreSQL 9.0, use a ZFS file system for the database
2) install and use pgbench to initialize a database as large as physical 
memory (i.e. it will blow away all caches)
3) run pgbench with -c of around 10 or so, let it run for 5 minutes or so
4) stop PostgreSQL, observe reported free memory statistics etc.