From owner-freebsd-fs@FreeBSD.ORG Wed May 27 21:36:24 2009 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 9F9B9106564A; Wed, 27 May 2009 21:36:24 +0000 (UTC) (envelope-from cdillon@wolves.k12.mo.us) Received: from mail.wolves.k12.mo.us (mail.wolves.k12.mo.us [207.160.214.1]) by mx1.freebsd.org (Postfix) with ESMTP id 72AB28FC17; Wed, 27 May 2009 21:36:24 +0000 (UTC) (envelope-from cdillon@wolves.k12.mo.us) Received: from localhost (localhost [127.0.0.1]) by mail.wolves.k12.mo.us (Postfix) with ESMTP id 68A3DB856; Wed, 27 May 2009 16:17:22 -0500 (CDT) X-Virus-Scanned: amavisd-new at wolves.k12.mo.us Received: from mail.wolves.k12.mo.us ([127.0.0.1]) by localhost (mail.wolves.k12.mo.us [127.0.0.1]) (amavisd-new, port 10024) with LMTP id a8870wjqvdYz; Wed, 27 May 2009 16:17:22 -0500 (CDT) Received: from wolves.k12.mo.us (mail.wolves.k12.mo.us [207.160.214.1]) by mail.wolves.k12.mo.us (Postfix) with ESMTP id 3E7B5B84B; Wed, 27 May 2009 16:17:22 -0500 (CDT) Received: from rstech28.int.wolves.k12.mo.us (rstech28.int.wolves.k12.mo.us [10.1.3.200]) by www.wolves.k12.mo.us (Horde Framework) with HTTP; Wed, 27 May 2009 16:17:22 -0500 Message-ID: <20090527161722.68971qn52gulblcy@www.wolves.k12.mo.us> Date: Wed, 27 May 2009 16:17:22 -0500 From: Chris Dillon To: Kip Macy References: <3c1674c90905151628h183cb1c2t8941843f8a828d4f@mail.gmail.com> <4A1C1E15.3080300@free.de> <3c1674c90905262138p7b196bc7ga2febb4667778e22@mail.gmail.com> In-Reply-To: <3c1674c90905262138p7b196bc7ga2febb4667778e22@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Internet Messaging Program (IMP) 4.3.3 / FreeBSD-6.4 Cc: freebsd-fs@freebsd.org Subject: Re: RFT: ZFS MFC 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: Wed, 27 May 2009 21:36:24 -0000 Quoting Kip Macy : > Machines with less than 4GB, especially those with workloads with poor > locality, should have prefetch disabled. You should not need the > other tunables on amd64 (i386 is both a lower priority and a harder > problem). When reporting problems report them with the tunables > removed as well as whatever your existing tunables are. Is vfs.zfs.prefetch_disable something that could have its default setting based on how much installed RAM the system has? Thank you for ZFS v13 back-port, BTW, now I'm anxious for FreeNAS to pick it up so I can use it on my new file server at home! -- Chris Dillon - NetEng/SysAdm Reeds Spring R-IV School District Technology Department 175 Elementary Rd. Reeds Spring, MO 65737 Voice: 417-272-8266 Fax: 417-272-0015