From owner-freebsd-stable@FreeBSD.ORG Wed Sep 9 10:10:13 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 625B3106566C; Wed, 9 Sep 2009 10:10:13 +0000 (UTC) (envelope-from fbsd@dannysplace.net) Received: from mail.dannysplace.net (mail.dannysplace.net [80.69.71.124]) by mx1.freebsd.org (Postfix) with ESMTP id 181108FC0A; Wed, 9 Sep 2009 10:10:13 +0000 (UTC) Received: from home-iinet.dannysplace.net ([203.206.171.212] helo=[192.168.10.10]) by mail.dannysplace.net with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1MlJeD-0004LI-Iu; Wed, 09 Sep 2009 19:39:30 +1000 Message-ID: <4AA77834.1010007@dannysplace.net> Date: Wed, 09 Sep 2009 19:41:08 +1000 From: Danny Carroll User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.1) Gecko/20090715 Thunderbird/3.0b3 MIME-Version: 1.0 To: Pawel Jakub Dawidek References: <20090908172332.476d9e0b.gerrit@pmp.uni-hannover.de> <20090908164413.GC1539@garage.freebsd.pl> <20090909090715.9d8a58ef.gerrit@pmp.uni-hannover.de> <20090909083313.GA1901@garage.freebsd.pl> In-Reply-To: <20090909083313.GA1901@garage.freebsd.pl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Authenticated-User: danny X-Authenticator: plain X-Sender-Verify: SUCCEEDED (sender exists & accepts mail) X-Exim-Version: 4.69 (build at 13-Aug-2009 20:22:24) X-Date: 2009-09-09 19:39:29 X-Connected-IP: 203.206.171.212:11565 X-Message-Linecount: 45 X-Body-Linecount: 30 X-Message-Size: 1914 X-Body-Size: 1092 X-Received-Count: 1 X-Recipient-Count: 4 X-Local-Recipient-Count: 4 X-Local-Recipient-Defer-Count: 0 X-Local-Recipient-Fail-Count: 0 X-SA-Exim-Connect-IP: 203.206.171.212 X-SA-Exim-Rcpt-To: pjd@FreeBSD.org, gerrit@pmp.uni-hannover.de, freebsd-fs@freebsd.org, freebsd-stable@freebsd.org X-SA-Exim-Mail-From: fbsd@dannysplace.net X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on ferrari.dannysplace.net X-Spam-Level: X-Spam-Status: No, score=-1.3 required=8.0 tests=ALL_TRUSTED,AWL autolearn=disabled version=3.2.5 X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail.dannysplace.net) Cc: freebsd-fs@freebsd.org, =?ISO-8859-1?Q?Gerrit_K=FChn?= , freebsd-stable@freebsd.org Subject: Re: zfs kernel panic X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: fbsd@dannysplace.net List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Sep 2009 10:10:13 -0000 On 9/09/2009 6:33 PM, Pawel Jakub Dawidek wrote: > On Wed, Sep 09, 2009 at 09:07:15AM +0200, Gerrit Kühn wrote: > >> On Tue, 8 Sep 2009 18:44:13 +0200 Pawel Jakub Dawidek >> wrote about Re: zfs kernel panic: >> >> PJD> If this is amd64, add vm.kmem_size="4G" to your loader.conf back. >> >> What about vm.kmem_size_max? Does that also need tuning? >> > No, this should be auto-tuned to some very large value. > > Pawel (et al), Would it be possible for you to post to the list your ideas of a complete set of tuning parameters for ZFS on amd64? I have used the wiki article as a reference (http://wiki.freebsd.org/ZFSTuningGuide) but it states that if you have > 2g ram and 7.2 then you do not need to tune at all. I for one would be interested in learning a little more about how the memory should be tuned. Specifically what might be interesting is to know, once a parameter is set, is there an easy way to find out how it's being used? i.e. If you start limiting the arc, is is possible to know what sort of hit/miss rate you are getting. -D