From owner-freebsd-questions@FreeBSD.ORG Mon Apr 5 00:37:16 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7E64B106564A for ; Mon, 5 Apr 2010 00:37:16 +0000 (UTC) (envelope-from dan.naumov@gmail.com) Received: from mail-bw0-f216.google.com (mail-bw0-f216.google.com [209.85.218.216]) by mx1.freebsd.org (Postfix) with ESMTP id D909B8FC0A for ; Mon, 5 Apr 2010 00:37:15 +0000 (UTC) Received: by bwz8 with SMTP id 8so2698067bwz.3 for ; Sun, 04 Apr 2010 17:37:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:received:message-id :subject:from:to:content-type; bh=Zhnkx0Bu4FxDRpQ/kBN31sg5XCGOmaOyIY4fg+VMCbg=; b=vrgWWitzaAVuOKqUatrb9TCN0O+Vq0YLHtxJT2zvAEIZM15RaMHNkE9Q+T87T2oJv6 HJv7EzwkrgMYbBBSz8FLiAq1goLMQ1z8eSvVOnCW8NK1tUfZySjVK35a8J3kfrqfKA4L eSPy4XPP2K5ciRzz8fvRRxAab6R4sMjEwOWUU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=iWE0TE6PwItP3W2q67ODhgYOfM56fs2rjzMaCssPIM2bNQMakPfAUCP1TNB38zmO9x PwX8rlzHLPI47BCAXgOt0GH4xme071lN3rwt4RBFsYyIA1KaAkJ/N0sPeUFmCbmuFRAb WPxdlyjldoATomMVX4F+/kIL/YujjtyWtM7L8= MIME-Version: 1.0 Received: by 10.204.116.203 with HTTP; Sun, 4 Apr 2010 17:37:14 -0700 (PDT) Date: Mon, 5 Apr 2010 03:37:14 +0300 Received: by 10.204.83.132 with SMTP id f4mr6261486bkl.73.1270427834656; Sun, 04 Apr 2010 17:37:14 -0700 (PDT) Message-ID: From: Dan Naumov To: jeremie@le-hen.org, freebsd-questions@freebsd.org, freebsd-hardware@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Cc: Subject: RE: Intel D945GSE vs Zotac ION ITX (was: Support for Zotac MB with nVidia ION chipset) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Apr 2010 00:37:16 -0000 Just a small comment regarding Atom suitability for a home NAS: feel free to completely ignore people saying that ZFS overhead is too much for an Atom to handle efficiently, they have no idea what they are talking about. I am using a Supermicro X7SPA-H board (Atom D510) and I an easily achieving ~85mb/s transfers over Samba to and from the machine. 85mb/s is also the best these drives will do and my CPU is nowhere near maxed during these transfers, so with better disks I would be easily saturating gigabit, while still having plenty of available CPU time. What you want is a good disk controller and fast and reliable disks, 2gb RAM is enough, but with 4gb ram you can basically safely enable prefetch for a very noticable boost in sequential pattern reads. Below are some numbers from my personal Atom NAS system: =================================================================== bonnie -s 8192 -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU 8192 29065 68.9 52027 39.8 39636 33.3 54057 95.4 105335 34.6 174.1 7.9 dd if=/dev/zero of=test1 bs=1M count=8192 8589934592 bytes transferred in 111.300481 secs (77177875 bytes/sec) (73,6mb/s) dd if=/dev/urandom of=test2 bs=1M count=8192 dd if=test2 of=/dev/zero bs=1M 8589934592 bytes transferred in 76.031399 secs (112978779 bytes/sec) (107,74mb/s) =================================================================== This is a ZFS mirror of 2 x 2tb WD Green drives with 32mb cache with the automatic headparking disabled via WDIDLE3. The drives are very cheap and hence, are the bottleneck in my case. - Sincerely, Dan Naumov