From owner-freebsd-fs@FreeBSD.ORG  Sun Nov 22 19:47:06 2009
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id E54EA1065672
	for <freebsd-fs@freebsd.org>; Sun, 22 Nov 2009 19:47:06 +0000 (UTC)
	(envelope-from randy@psg.com)
Received: from ran.psg.com (ran.psg.com [IPv6:2001:418:1::36])
	by mx1.freebsd.org (Postfix) with ESMTP id C858C8FC13
	for <freebsd-fs@freebsd.org>; Sun, 22 Nov 2009 19:47:06 +0000 (UTC)
Received: from localhost ([127.0.0.1] helo=rmac.psg.com)
	by ran.psg.com with esmtp (Exim 4.69 (FreeBSD))
	(envelope-from <randy@psg.com>)
	id 1NCIOm-000DXE-RO; Sun, 22 Nov 2009 19:47:04 +0000
Received: from host-40-47.meeting.ietf.org.psg.com (localhost [127.0.0.1])
	by rmac.psg.com (Postfix) with ESMTP id 3EE262C3292B;
	Mon, 23 Nov 2009 04:47:04 +0900 (JST)
Date: Mon, 23 Nov 2009 04:47:03 +0900
Message-ID: <m2my2efiko.wl%randy@psg.com>
From: Randy Bush <randy@psg.com>
To: Ollivier Robert <roberto@keltia.freenix.fr>
In-Reply-To: <20091122154228.GB55532@rron.freenix.org>
References: <m2my2hkj2y.wl%randy@psg.com>
	<20091122154228.GB55532@rron.freenix.org>
User-Agent: Wanderlust/2.15.5 (Almost Unreal) Emacs/22.3 Mule/5.0 (SAKAKI)
MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: text/plain; charset=US-ASCII
Cc: freebsd-fs@freebsd.org
Subject: Re: 7.2 dies in zfs
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 22 Nov 2009 19:47:07 -0000

> I've given up on ZFS on i386.  Whatever tuning you could do is only
> delaying the inevitable.  Even with lots of RAM, it will panic.  I'd
> love being proven wrong as I also hav a 4 GB i386 with ZFS and it
> panics regularely.

i am not sure one can not tune it to stay up.  it's just not clear how.
and that is the critical point.

on a 4g i386 with moderate+ load, my current parms are
    vm.kmem_size=1500M
    vm.kmem_size_max=2G
    vfs.zfs.arc_min=120M
    vfs.zfs.arc_max=900M
    vfs.zfs.prefetch_disable=1
and it's up over two days, wooo wooo!

i suspect that i will next lower arc max.



randy