From owner-freebsd-current@FreeBSD.ORG Wed Mar 1 19:03:07 2006 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2910C16A420; Wed, 1 Mar 2006 19:03:07 +0000 (GMT) (envelope-from julian@elischer.org) Received: from a50.ironport.com (a50.ironport.com [63.251.108.112]) by mx1.FreeBSD.org (Postfix) with ESMTP id E0C4A43D48; Wed, 1 Mar 2006 19:03:06 +0000 (GMT) (envelope-from julian@elischer.org) Received: from unknown (HELO [10.251.17.229]) ([10.251.17.229]) by a50.ironport.com with ESMTP; 01 Mar 2006 11:03:08 -0800 Message-ID: <4405EFE9.6030807@elischer.org> Date: Wed, 01 Mar 2006 11:03:05 -0800 From: Julian Elischer User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.11) Gecko/20050727 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Brian Candler References: <200603010505.k2155HfQ003205@aldan.algebra.com> <20060301144124.GA14411@uk.tiscali.com> In-Reply-To: <20060301144124.GA14411@uk.tiscali.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: sos@freebsd.org, "Mikhail T." , current@freebsd.org Subject: Re: pitiful performance of an SATA150 drive X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Mar 2006 19:03:07 -0000 Brian Candler wrote: >On Wed, Mar 01, 2006 at 12:05:17AM -0500, Mikhail T. wrote: > > >>I installed a new 500Gb SATA drive into my 6.1 system and am greatly >>disappointed with its performance. Although straight reading is >>Ok at around 32Mb/s, the writing is never more than 7Mb/s (as reported >>by `systat 1 -vm' while running `cat < /dev/zero > /dev/ad8'). >> >>I reported this a few months ago (running 6.0 then), and one of the >>suggestions was, the drive is bad. Well, I'm seeing the same with its >>replacement... >> >>Also, KNOPPIX-4.0.2 can write to the drive at 22Mb/s (using dd). >> >> I believe that linux uses bufferring in their 'raw' disks so that you may be actually doing larger reads and writes than you know.. (of course my knowledge of Linux is a bit old so they may have changed that) > >Just to be clear: this is Knoppix running on the *same* machine as you've >been testing FreeBSD? (In other words, you've not unplugged the drive and >plugged it into a different PC or controller?) > >Aside: why are you using cat under FreeBSD, but dd under Knoppix? I'd use dd >everywhere for consistency. > >Regards, > >Brian. >_______________________________________________ >freebsd-current@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-current >To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >