From owner-freebsd-fs@FreeBSD.ORG Fri Jan 22 06:09:20 2010 Return-Path: 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 C04151065670 for ; Fri, 22 Jan 2010 06:09:20 +0000 (UTC) (envelope-from artemb@gmail.com) Received: from mail-iw0-f174.google.com (mail-iw0-f174.google.com [209.85.223.174]) by mx1.freebsd.org (Postfix) with ESMTP id 831BB8FC14 for ; Fri, 22 Jan 2010 06:09:20 +0000 (UTC) Received: by iwn4 with SMTP id 4so130021iwn.27 for ; Thu, 21 Jan 2010 22:09:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=BC8lzL27/haxcmoEmRUIhTTL8UYM8FQ/2IuAOA6ajMM=; b=lPUimAo/X15DEwYUfBAEOF3AuWCcc9VX26+BVaQ9ZpRpropQsphteEcj1H/DR+ei+B TMi5VNoUo5qeNCNt9GAEHY/wYhHErCOUaHr/1WOqdWd0STDzrPHxIWLyVrKsZItmILTg uqs9HGgTZvC4p5zhT4PPktLo5cGUnBH8xLKiI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=RMXP1/++lD52WSo+XQ1nqP9MsJK3GVgjuR91v42Ueok5GVOOBU11teqi90KpJBPHro /1ZB8HyqaCc+h6YU4c4Ps09s4rE/lMKQYVXAvbSRUhQqIeGjr7TNUivqmkdcIlsUC6OV BkuE36sIDlE+PxWlnTTQwS/38hlc6LK68A3xw= MIME-Version: 1.0 Sender: artemb@gmail.com Received: by 10.231.151.207 with SMTP id d15mr3966363ibw.44.1264140559712; Thu, 21 Jan 2010 22:09:19 -0800 (PST) In-Reply-To: <20100122042843.GA8858@polands.org> References: <4B58976E.1020402@polands.org> <4B58A069.8000802@egr.msu.edu> <4B58BD2D.30803@rcn.com> <4B58D4D3.80009@egr.msu.edu> <20100122042843.GA8858@polands.org> Date: Thu, 21 Jan 2010 22:09:19 -0800 X-Google-Sender-Auth: 6e8cd2d6384ba288 Message-ID: From: Artem Belevich To: Doug Poland Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Repeatable ZFS "kmem map too small" panic on 8.0-STABLE X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jan 2010 06:09:20 -0000 Next step would be to set vfs.zfs.arc_max to a value that's somewhat below your physical memory size. Let's say - 1G or so. On my box with 8GB of RAM I set these values: vfs.zfs.arc_max=3D"6500M" vfs.zfs.arc_min=3D"4G" You didn't mention how recent is your kernel. There were quite a few bugfixes committed to -8. Make sure your kernel is r201987 or newer. --Artem On Thu, Jan 21, 2010 at 8:28 PM, Doug Poland wrote: > Interesting discussion :) =A0I added vm.kmem_size=3D"20G" to > /boot/loader.conf per your instructions. =A0This time, it didn't panic at > the same point in the test, however, it appears the filesystem is > "hanging". > > On the fdisk test, I hit T and get: > cmd: fsdisk 37066 [zio->io_cv)] 245.62r 0.12u 25.10s 0 > > My various metrics are still running, but anything that needs the > filesystem appears "stuck". > > The memory usage of the item "solaris" (vmstat -m | grep solaris) spiked > at 3334781952 (3180.30 MiB). > > # zpool iostat 2, a T shows: > load: 0.00 =A0cmd: zpool 934 [tx->tx_quiesce_done_cv)] 2052.45r 0.06 u 0.= 39s 0% 0k > > # vmstat -v | grep solaris to disk every second and it's > hung at: > load: 0.00 =A0cmd: sh 38551 [zfs] 909.85r 0.00u 0.00s 0% 16k > > Any suggestions! > > -- > Regards, > Doug >