From owner-freebsd-stable@FreeBSD.ORG Tue Mar 27 18:07:30 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id A1F3616A406 for ; Tue, 27 Mar 2007 18:07:30 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from mx0.thekeelecentre.com (mx0.thekeelecentre.com [217.206.238.167]) by mx1.freebsd.org (Postfix) with ESMTP id 5D90013C45D for ; Tue, 27 Mar 2007 18:07:30 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from localhost (mailfil.mx0.thekeelecentre.com [217.206.238.165]) by mx0.thekeelecentre.com (Postfix) with ESMTP id C0EB74233; Tue, 27 Mar 2007 19:07:29 +0100 (BST) X-Virus-Scanned: by amavisd-new at mx0.thekeelecentre.com Received: from mx0.thekeelecentre.com ([217.206.238.167]) by localhost (mailfil.mx0.thekeelecentre.com [217.206.238.165]) (amavisd-new, port 10024) with ESMTP id R5c4YkUUpQAd; Tue, 27 Mar 2007 19:07:24 +0100 (BST) Received: from [217.206.238.190] (sylvester.tector.org.uk [217.206.238.190]) by mx0.thekeelecentre.com (Postfix) with ESMTP id C00F64210; Tue, 27 Mar 2007 19:07:24 +0100 (BST) Message-ID: <46095CE5.5080600@thekeelecentre.com> Date: Tue, 27 Mar 2007 19:05:25 +0100 From: Richard Tector User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 To: Matthew Jacob References: <460959E8.207@thekeelecentre.com> <7579f7fb0703271102q1a866897x2d63a86e72895125@mail.gmail.com> In-Reply-To: <7579f7fb0703271102q1a866897x2d63a86e72895125@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: Dell SAS5 Performance Issue X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Mar 2007 18:07:30 -0000 Matthew Jacob wrote: > It's been seen before but the fix isn't know yet. > > On 3/27/07, Richard Tector wrote: >> I'm suffering from very slow write performance on a Dell PowerEdge 860 >> with the SAS5/IR controller (mpt driver) running either 6.2-RELEASE or >> 6.2-STABLE with sources from yesterday. The controller hosts 2 Western >> Digital 320GB SATA disks in a RAID1 configuration. >> Reads approach 65MB/s however writes appear extremely slow, in the >> region of 6-7MB/s with a dd and a blocksize of 1MB all the way down to >> about 300KB/s while extracting a ports snapshot. >> >> It was suggested to me that perhaps write caching has been disabled on >> the controller however no options exist within the BIOS configuration to >> view/adjust *any* caching options. >> >> Has anyone else experienced this issue? If so how did they resolve it? >> Also, is there any way to toggle the caching settings from FreeBSD? >> >> Regards, >> >> Richard Tector >> _______________________________________________ >> freebsd-stable@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable >> To unsubscribe, send any mail to >> "freebsd-stable-unsubscribe@freebsd.org" >> Thank you for the quick reply. Is there any information I could obtain that would be of use to you in tracking this one down? Regards, Richard