From owner-freebsd-questions@FreeBSD.ORG Sun Oct 17 15:00:07 2004 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 15E4B16A4CE for ; Sun, 17 Oct 2004 15:00:07 +0000 (GMT) Received: from tierra2.ng.fadesa.es (tierra2.ng.fadesa.es [195.55.55.166]) by mx1.FreeBSD.org (Postfix) with ESMTP id F10E543D66 for ; Sun, 17 Oct 2004 15:00:03 +0000 (GMT) (envelope-from fandino@ng.fadesa.es) Received: from [195.55.55.163] ([195.55.55.163]) (authenticated bits=0) by tierra2.ng.fadesa.es (8.12.10/8.12.10) with ESMTP id i9HF02i3023274 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 17 Oct 2004 17:00:02 +0200 Message-ID: <417288F2.9090502@ng.fadesa.es> Date: Sun, 17 Oct 2004 17:00:02 +0200 From: fandino User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040616 X-Accept-Language: gl, en, es MIME-Version: 1.0 Cc: freebsd-questions@freebsd.org References: <416EB6B1.6060405@ng.fadesa.es> <416F849F.8020508@solid-state-logic.com> <416F90E6.10108@ng.fadesa.es> <200410151223.33355.howells@kde.org> <416FF477.4010408@ng.fadesa.es> <20041015131432.srwo0wog000skgcs@www.sweetdreamsracing.biz> <41700BBB.50003@ng.fadesa.es> <20041015141611.t8cgso00co4wggoc@www.sweetdreamsracing.biz> <41713CB5.3010109@ng.fadesa.es> In-Reply-To: <41713CB5.3010109@ng.fadesa.es> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated-Sender: user fandino from 195.55.55.163 X-Virus-Scanned: clamd / ClamAV version 0.75.1, clamav-milter version 0.75c on tierra2 X-Virus-Status: Clean Subject: Re: FreeBSD and poor ata performance X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: fandino@ng.fadesa.es List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Oct 2004 15:00:07 -0000 > Kenneth Culver wrote: > >>> but then why does read/write tests over raw devices performs so bad? >>> AFAIK on raw devices not filesystem, journaling, caches, etc are >>> involved. >>> _______________________________________________ >> >> >> >> Like I said before, you might not have been testing the throughput of >> the disks, >> instead you may have been testing the throughput of /dev/zero. > > > I woluld like to have the throughput of /dev/zero on my disks. :-) > > > # dd if=/dev/zero of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 3.414659 secs (314450672 bytes/sec) I'm redirecting this thread to current@ because something seems broken. GNU/Linux 2.4.18 with ext2: 56848 K/sec FreeBSD 5.3b7 with default fs: 26347 K/sec FreeBSD 5.3b7 with default fs(async): 26566 K/sec FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec OpenBSD 3.5 UFS fs: 55277 K/sec * Each disk of the raid had a throughput of approx. 15000 K/sec ** Each disk of the raid had a throughput of approx. 7500 K/sec Each disk of the raid split the throughput by half. http://lists.freebsd.org/pipermail/freebsd-current/2004-October/040567.html