From owner-freebsd-fs@FreeBSD.ORG Sun Mar 6 08:25:21 2011 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 E1613106564A for ; Sun, 6 Mar 2011 08:25:21 +0000 (UTC) (envelope-from boydjd@jbip.net) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id 73F0D8FC16 for ; Sun, 6 Mar 2011 08:25:21 +0000 (UTC) Received: by fxm19 with SMTP id 19so3730587fxm.13 for ; Sun, 06 Mar 2011 00:25:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jbip.net; s=google; h=domainkey-signature:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type:content-transfer-encoding; bh=7wsutrzOk06D15DwykGWLJpC+T94JD3mDAIo8PTVuXI=; b=ep1eLbR2jxdeWvx9+sYtsIRjw9cmFPdINhX/0P9ZD6IXHwlS4XdBbNgyba5GHmMtJ4 h3BI4gSl5gMRYFlQzwuefmwUouBDFkc5sx4JwhvpYqQSK6QpiPxao8TxAB+Mmy8da9Jx PyX3Ahhn4CUj9tX7qUCaMDD0hD12VVDtWZXZw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=jbip.net; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type:content-transfer-encoding; b=At7WJy5bLaYluFO4MJUFdNT8edIzde2I8Mms8rRZroB5vu2qFOUYhUxjhrFMhMVu3p UsVU4JSHNuFsNIyYzyRshRLrcuEC9+VTi0HU4bo3H8CuMnFQrhlnE/2HQ5UMGGZ6OQBv IVheg03d5qwrRLirC2rgnVLY9K/fNxcrKYBME= Received: by 10.223.15.152 with SMTP id k24mr643652faa.96.1299398403092; Sun, 06 Mar 2011 00:00:03 -0800 (PST) MIME-Version: 1.0 Received: by 10.223.144.137 with HTTP; Sat, 5 Mar 2011 23:59:43 -0800 (PST) In-Reply-To: <20110304105608.GA23887@icarus.home.lan> References: <1299232133.18671.3.camel@pc286.embl.fr> <20110304100517.GA23249@icarus.home.lan> <20110304105608.GA23887@icarus.home.lan> From: Joshua Boyd Date: Sun, 6 Mar 2011 02:59:43 -0500 Message-ID: To: Jeremy Chadwick Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: kmem_map too small with ZFS and 8.2-RELEASE 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: Sun, 06 Mar 2011 08:25:22 -0000 On Fri, Mar 4, 2011 at 5:56 AM, Jeremy Chadwick wrote: > If you get better performance -- really, truly, honestly -- with > prefetch enabled on your system, then I strongly recommend you keep it > enabled. =A0However, for what it's worth (probably not much), this is the > first I've ever heard of a FreeBSD system performing better with > prefetch enabled. I just recently turned it on after having it turned off for a long time ... my speeds went from ~300MB/s to 600+MB/s in bonnie++. This is a dual core AM3 system with 8GB of ram, and 15 disks in a striped raidz configuration (3 sets striped). --=20 Joshua Boyd JBipNet E-mail: boydjd@jbip.net http://www.jbip.net