From owner-freebsd-stable@FreeBSD.ORG  Mon Jan  7 12:26:05 2008
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 50BE716A419;
	Mon,  7 Jan 2008 12:26:05 +0000 (UTC)
	(envelope-from petefrench@ticketswitch.com)
Received: from angel.ticketswitch.com (angel.ticketswitch.com
	[IPv6:2002:57e0:1d4e::1])
	by mx1.freebsd.org (Postfix) with ESMTP id 15C1E13C45B;
	Mon,  7 Jan 2008 12:26:05 +0000 (UTC)
	(envelope-from petefrench@ticketswitch.com)
Received: from smaug.rattatosk ([10.50.50.2])
	by angel.ticketswitch.com with esmtps (TLSv1:AES256-SHA:256)
	(Exim 4.67 (FreeBSD)) (envelope-from <petefrench@ticketswitch.com>)
	id 1JBr3M-0009ob-FI; Mon, 07 Jan 2008 12:26:04 +0000
Received: from dilbert.rattatosk ([10.50.50.6] helo=dilbert.ticketswitch.com)
	by smaug.rattatosk with esmtp (Exim 4.67 (FreeBSD))
	(envelope-from <petefrench@ticketswitch.com>)
	id 1JBr3L-0009vn-Jp; Mon, 07 Jan 2008 12:26:04 +0000
Received: from petefrench by dilbert.ticketswitch.com with local (Exim 4.68
	(FreeBSD)) (envelope-from <petefrench@ticketswitch.com>)
	id 1JBr3L-0000Mf-JD; Mon, 07 Jan 2008 12:26:03 +0000
To: mharo@FreeBSD.org
In-Reply-To: <4cd036390801070409l4d8f1cf9te86772f188f89dfe@mail.gmail.com>
Message-Id: <E1JBr3L-0000Mf-JD@dilbert.ticketswitch.com>
From: Pete French <petefrench@ticketswitch.com>
Date: Mon, 07 Jan 2008 12:26:03 +0000
Cc: stable@freebsd.org
Subject: Re: kmem_map too small under ZFS
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 07 Jan 2008 12:26:05 -0000

> vm.kmem_size="512M"
> vm.kmem_size_max="512M"

I have similar to this in mine...

vm.kmem_size=629145600
vm.kmem_size_max=629145600

which is about 600 meg - the machine has 2 gig of RAM.

> vfs.zfs.prefetch_disable="1"
> vfs.zfs.arc_max="150M"
> kern.maxvnodes="400000"

now these I havent got - I did see a reference to disabling the intent log,
which is what I was about to try. I will give your settings a shot too.

> Most of these settings came from various mailing list postings.  It's
> possible that some don't do anything useful, but I haven't had a zfs
> related panic since.

Worth a try - might see if I can find a way tro reliably trigger the
opanic and then tyrn these bits back on one at a time too.

thanks,

-pete.