From owner-freebsd-performance@FreeBSD.ORG Fri Apr 29 18:09:56 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 BE16116A4CE for ; Fri, 29 Apr 2005 18:09:56 +0000 (GMT) Received: from mh1.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id CB4DD43D2F for ; Fri, 29 Apr 2005 18:09:55 +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 j3TI9s5C078388; Fri, 29 Apr 2005 13:09:54 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <42727839.4030703@centtech.com> Date: Fri, 29 Apr 2005 13:08:57 -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: killing@multiplay.co.uk References: <20050428162201.39269.qmail@web41214.mail.yahoo.com><42711726.2000607@centtech.com><006201c54c46$14c0d290$b3db87d4@multiplay.co.uk> <4271EFCA.1060605@samsco.org> <093701c54caa$303aac30$7f06000a@int.mediasurface.com> In-Reply-To: <093701c54caa$303aac30$7f06000a@int.mediasurface.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.82/860/Fri Apr 29 08:45:14 2005 on mh1.centtech.com X-Virus-Status: Clean cc: freebsd-performance@freebsd.org 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: Fri, 29 Apr 2005 18:09:56 -0000 Steven Hartland wrote: > ----- Original Message ----- From: "Scott Long" > >>> Ok some real strange going on write performance is ~ 140MB/s: [..snip..] >>> where as read is ~42MB/s [..snip..] > So it doesn't seem like caching is an issue and as others are seeing > similar performance issues on other RAID controllers is could well > not be a driver issue but I'm not ruling that out as yet as it could be > the same problem in each respective driver. > So far Highpoint 1820a and 3ware ?? ( Pete can u fill in the blank here ) > are exhibiting the same issue. As I posted earlier also, I'm seeing the same behavior to a Fiber Channel RAID array (15 400GB SATA150 disks in RAID5 config). I'm using a QLogic HBA connected directly to the SATA array. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------