From owner-freebsd-performance@FreeBSD.ORG Thu Apr 28 17:03:27 2005 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C7AFB16A4CE for ; Thu, 28 Apr 2005 17:03:27 +0000 (GMT) Received: from mh1.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id DB0BA43D54 for ; Thu, 28 Apr 2005 17:03:26 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [10.177.171.220] (neutrino.centtech.com [10.177.171.220]) by mh1.centtech.com (8.13.1/8.13.1) with ESMTP id j3SH3P0F066218; Thu, 28 Apr 2005 12:03:26 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <42711726.2000607@centtech.com> Date: Thu, 28 Apr 2005 12:02:30 -0500 From: Eric Anderson User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.5) Gecko/20050325 X-Accept-Language: en-us, en MIME-Version: 1.0 To: =?ISO-8859-15?Q?=22Arne_=5C=22W=F6rner=5C=22=22?= References: <20050428162201.39269.qmail@web41214.mail.yahoo.com> In-Reply-To: <20050428162201.39269.qmail@web41214.mail.yahoo.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: ClamAV 0.82/858/Thu Apr 28 09:02:38 2005 on mh1.centtech.com X-Virus-Status: Clean cc: freebsd-performance@freebsd.org cc: Steven Hartland Subject: Re: Very low disk performance Highpoint 1820a X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2005 17:03:27 -0000 Arne W=F6rner wrote: > --- Steven Hartland wrote: >=20 >>Only on write this is a read test. >> >=20 > Oh. Ok! :-) >=20 > But there is a striping-like effect (especially when u use n=3D8 > discs in one RAID-5 and when u do sequential read), so that the > performance could be easily (n-1)*40MB/sec (which would be in your > case 350MB/sec; my single ATA disc reads 40 or about 40 MB/sec). >=20 > So I would say, that something in the ATA driver is sub-optimal > and worse than before. But I do not know what... There are so many > lines... I don't think it is ATA related - my tests were through a Fiber Channel=20 card. My reads were 1/2 of my writes.. Eric --=20 ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------