From owner-freebsd-stable@FreeBSD.ORG Tue Mar 27 17:59:49 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 D756416A400 for ; Tue, 27 Mar 2007 17:59:49 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 6743813C484 for ; Tue, 27 Mar 2007 17:59:49 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1HWFwx-0000UZ-45 for freebsd-stable@freebsd.org; Tue, 27 Mar 2007 19:59:15 +0200 Received: from 83-131-174-33.adsl.net.t-com.hr ([83.131.174.33]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 27 Mar 2007 19:59:15 +0200 Received: from ivoras by 83-131-174-33.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 27 Mar 2007 19:59:15 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-stable@freebsd.org From: Ivan Voras Date: Tue, 27 Mar 2007 19:58:48 +0200 Lines: 44 Message-ID: References: <460959E8.207@thekeelecentre.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig6B97C613D309B5B7CCB243B3" X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 83-131-174-33.adsl.net.t-com.hr User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) In-Reply-To: <460959E8.207@thekeelecentre.com> X-Enigmail-Version: 0.94.1.2 Sender: news 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 17:59:49 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig6B97C613D309B5B7CCB243B3 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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. >=20 > It was suggested to me that perhaps write caching has been disabled on > the controller however no options exist within the BIOS configuration t= o > view/adjust *any* caching options. You looked in the controller's BIOS, not motherboard's, right? There should be at least a "write through" vs "write back" switch... If you don't have a battery for the SAS controller, get one. > Has anyone else experienced this issue?=20 No, but can you post the relevant bits for the controller from dmesg? --------------enig6B97C613D309B5B7CCB243B3 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGCVtZldnAQVacBcgRAg1/AKDp+fq/AP6tqq6EkCCAJ4TarfeL5ACg2vaK YvdKtSmUyZU+2Cxxsa1lTVU= =IXhb -----END PGP SIGNATURE----- --------------enig6B97C613D309B5B7CCB243B3--