From owner-freebsd-questions@FreeBSD.ORG Sun Aug 24 20:55:50 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D4A6F16A4BF for ; Sun, 24 Aug 2003 20:55:50 -0700 (PDT) Received: from mail.seekingfire.com (coyote.seekingfire.com [24.72.10.212]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0782D43FE0 for ; Sun, 24 Aug 2003 20:55:50 -0700 (PDT) (envelope-from tillman@seekingfire.com) Received: from blues.seekingfire.prv (blues.seekingfire.prv [192.168.23.211]) by mail.seekingfire.com (Postfix) with ESMTP id 187B063 for ; Sun, 24 Aug 2003 21:55:49 -0600 (CST) Received: (from tillman@localhost) by blues.seekingfire.prv (8.11.6/8.11.6) id h7P3tn731780 for freebsd-questions@freebsd.org; Sun, 24 Aug 2003 21:55:49 -0600 Date: Sun, 24 Aug 2003 21:55:48 -0600 From: Tillman Hodgson To: freebsd-questions@freebsd.org Message-ID: <20030824215548.H30641@seekingfire.com> References: <20030825003158.GA72370@falcon.midgard.homeip.net> <000001c36ab7$8017aae0$0300a8c0@owl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <000001c36ab7$8017aae0$0300a8c0@owl>; from canman@ev1.net on Sun, Aug 24, 2003 at 10:18:05PM -0500 X-Urban-Legend: There is lots of hidden information in headers Subject: Re: hard disk performance issue X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Aug 2003 03:55:51 -0000 On Sun, Aug 24, 2003 at 10:18:05PM -0500, Chris Newman wrote: > Hmm... when I do what you suggest, here's what I get... > > tigger# dd if=/dev/ad8s1d of=/dev/null bs=64k count=100 > 100+0 records in > 100+0 records out > 6553600 bytes transferred in 0.147501 secs (44430888 bytes/sec) > tigger# dd if=/dev/ad8s1d of=/dev/null bs=100k count=100 > 100+0 records in > 100+0 records out > 10240000 bytes transferred in 0.230168 secs (44489246 bytes/sec) > tigger# dd if=/dev/ad8s1d of=/dev/null bs=200k count=100 > 100+0 records in > 100+0 records out > 20480000 bytes transferred in 0.429506 secs (47682693 bytes/sec) > > ~47MB ? huge difference > > I'm still not sure at this point what the best way is to evaluate whether > I'm getting my money's worth out of this disk/controller. How do I do a good > benchmark of the speed? /usr/ports/benchmarks/bonnie++ with and without the new controller? Of course, that'll only tell you if it's faster. "Value" means that you're paying for extra speed that you actually /need/. The best way to measure this is to benchmark whatever you use this particular computer for and decide if any speed difference is worth the price of the controller. -T -- The supreme irony of life is that hardly anyone gets out alive. - Robert Heinlein