From owner-freebsd-current@FreeBSD.ORG Thu Mar 3 12:52:13 2011 Return-Path: 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 BA0CB106566B; Thu, 3 Mar 2011 12:52:13 +0000 (UTC) (envelope-from alexander@leidinger.net) Received: from mail.ebusiness-leidinger.de (mail.ebusiness-leidinger.de [217.11.53.44]) by mx1.freebsd.org (Postfix) with ESMTP id 6C8888FC08; Thu, 3 Mar 2011 12:52:13 +0000 (UTC) Received: from outgoing.leidinger.net (p5B32EB58.dip.t-dialin.net [91.50.235.88]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id 02A53844015; Thu, 3 Mar 2011 13:52:06 +0100 (CET) Received: from webmail.leidinger.net (unknown [IPv6:fd73:10c7:2053:1::2:102]) by outgoing.leidinger.net (Postfix) with ESMTP id B2AD42426; Thu, 3 Mar 2011 13:52:02 +0100 (CET) Received: (from www@localhost) by webmail.leidinger.net (8.14.4/8.13.8/Submit) id p23CpleD022635; Thu, 3 Mar 2011 13:51:47 +0100 (CET) (envelope-from Alexander@Leidinger.net) Received: from pslux.ec.europa.eu (pslux.ec.europa.eu [158.169.9.14]) by webmail.leidinger.net (Horde Framework) with HTTP; Thu, 03 Mar 2011 13:51:47 +0100 Message-ID: <20110303135147.20096fpe1ntz75k8@webmail.leidinger.net> Date: Thu, 03 Mar 2011 13:51:47 +0100 From: Alexander Leidinger To: Fabian Keil References: <20110227202957.GD1992@garage.freebsd.pl> <20110228192129.119cac0c@r500.local> <20110228214847.0000078c@unknown> <20110303130130.29a066a1@r500.local> In-Reply-To: <20110303130130.29a066a1@r500.local> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Dynamic Internet Messaging Program (DIMP) H3 (1.1.4) X-EBL-MailScanner-Information: Please contact the ISP for more information X-EBL-MailScanner-ID: 02A53844015.A5B6F X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=1.274, required 6, autolearn=disabled, RDNS_NONE 1.27) X-EBL-MailScanner-SpamScore: s X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1299761529.2035@9Ov1BlmNLtBzEt2VPIk/JA X-EBL-Spam-Status: No Cc: freebsd-fs@FreeBSD.org, Pawel, freebsd-current@FreeBSD.org, Dawidek Subject: Re: HEADS UP: ZFSv28 is in! X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Mar 2011 12:52:13 -0000 Quoting Fabian Keil (from Thu, 3 Mar 2011 13:01:30 +0100): > Alexander Leidinger wrote: > >> On Mon, 28 Feb 2011 19:21:29 +0100 Fabian Keil >> wrote: >> >> > Pawel Jakub Dawidek wrote: >> > >> > > I just committed ZFSv28 to HEAD. >> > >> > I updated the system without removing the tuning for ZFSv15 >> > first, and somehow this completely messed up the performance. >> > Booting the system took more than ten minutes and even once >> > it was up it was next to unresponsive. >> > >> > I'm not sure which sysctl was to blame, but after removing >> > all but vfs.zfs.arc_max="800M" and rebooting, the problem >> > was gone. >> >> When you add the tuning back, does it take minutes again to boot? If >> not, I assume it was cleaning up some leftovers the old version was not >> able to cleanup. > > I haven't tried that yet, but as I didn't upgrade the system's > storage pool I don't think ZFS is supposed to do any such clean-ups. AFAIK the new code knows how to remove some superfluous parts in your pool (no matter at which version the pool is), which the old code just skipped over. Such leftovers may not be in all pools, they show up just in some use cases. For this reason I asked to verify by adding the tuning back to this system (if possible). If it is not a production-like system which does not accept downtime, this verification consumes less resources than sending out a developer hunting for a problem which may not even exist. Bye, Alexander. -- A short cut is the longest distance between two points. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137