From owner-freebsd-stable@FreeBSD.ORG Wed Jan 14 05:27:37 2004 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 989D616A4CE for ; Wed, 14 Jan 2004 05:27:37 -0800 (PST) Received: from osku.suutari.iki.fi (osku.syncrontech.com [213.28.98.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id 366A043D78 for ; Wed, 14 Jan 2004 05:27:14 -0800 (PST) (envelope-from ari@suutari.iki.fi) Received: from coffee.syncrontech.com (coffee.syncrontech.com [62.71.8.37]) by osku.suutari.iki.fi (8.12.8p1/8.12.8) with ESMTP id i0EDRCdf024629; Wed, 14 Jan 2004 15:27:12 +0200 (EET) (envelope-from ari@suutari.iki.fi) From: Ari Suutari Organization: At Home To: Karl Pielorz , freebsd-stable@freebsd.org Date: Wed, 14 Jan 2004 15:27:11 +0200 User-Agent: KMail/1.5.4 References: <200401141453.50150.ari@suutari.iki.fi> <741002750.1074086443@rainbow> In-Reply-To: <741002750.1074086443@rainbow> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200401141527.11930.ari@suutari.iki.fi> Subject: Re: Adaptect raid performance with FreeBSD X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Jan 2004 13:27:37 -0000 Hi, On Wednesday 14 January 2004 15:20, Karl Pielorz wrote: > > So, I get only about 25MB/s. Shouldn't I be getting something > > like 70 MB/s, or even more since there are two disks that > > can server read requests ? > > Hmmm, what happens if you run two of those at once? Running 5 dd's at once gives in iostat: tty da0 da1 acd0 cpu tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id 1 146 0.00 0 0.00 64.00 473 29.58 0.00 0 0.00 0 0 1 1 98 0 38 0.00 0 0.00 64.00 625 39.06 0.00 0 0.00 0 0 2 1 97 0 38 0.00 0 0.00 64.00 492 30.76 0.00 0 0.00 0 0 2 1 97 0 38 0.00 0 0.00 64.00 506 31.62 0.00 0 0.00 0 0 1 0 98 0 38 0.00 0 0.00 64.00 495 30.94 0.00 0 0.00 0 0 1 1 98 The peak seems to be 39 Mb/s. > > But, I can't remember seeing adjusting it making any real-world difference > - what happens if you max it out (e.g. 128, or 256)? I'll have to try this. However, I also doubt that it is not going to change anything. Ari S. -- Ari Suutari Lemi, Finland