From owner-freebsd-questions@FreeBSD.ORG Sun Feb 6 10:03:29 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D200D16A4F2 for ; Sun, 6 Feb 2005 10:03:27 +0000 (GMT) Received: from av4-1-sn3.vrr.skanova.net (av4-1-sn3.vrr.skanova.net [81.228.9.111]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4051A43D2F for ; Sun, 6 Feb 2005 10:03:27 +0000 (GMT) (envelope-from homebell@telia.com) Received: by av4-1-sn3.vrr.skanova.net (Postfix, from userid 502) id 091DA37E63; Sun, 6 Feb 2005 11:03:26 +0100 (CET) Received: from smtp1-2-sn3.vrr.skanova.net (smtp1-2-sn3.vrr.skanova.net [81.228.9.178]) by av4-1-sn3.vrr.skanova.net (Postfix) with ESMTP id EAB3A37E61 for ; Sun, 6 Feb 2005 11:03:25 +0100 (CET) Received: from [192.168.0.3] (h138n2fls31o930.telia.com [217.210.244.138]) by smtp1-2-sn3.vrr.skanova.net (Postfix) with ESMTP id C9F7338014 for ; Sun, 6 Feb 2005 11:03:25 +0100 (CET) Message-ID: <4205EB6D.8040600@telia.com> Date: Sun, 06 Feb 2005 11:03:25 +0100 From: "Kjell B." Organization: Not particularly organized User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041206 Thunderbird/1.0 Mnenhy/0.7.1 X-Accept-Language: en-us, en MIME-Version: 1.0 To: questions@freebsd.org X-Enigmail-Version: 0.90.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Subject: ATA Tagged Queuing? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Feb 2005 10:03:29 -0000 I'm considering turning on Tagged Command Queuing in my ATA system. My disks are all Hitachi 7K250 (two HDS722512VLAT80 and one HDS722516VLAT80) which according to Hitachi support this feature (queue depth = 32). However, I read in http://lists.freebsd.org/pipermail/freebsd-current/2003-July/007378.html that there may be problems doing this and not really improving performance. Is that recommendation still valid or should I go for it? My uname: [homebell] ~> uname -a FreeBSD homebell.dyndns.org 4.10-RELEASE-p2 FreeBSD 4.10-RELEASE-p2 #0: Mon Oct 18 21:48:34 CEST 2004 homebell@homebell.dyndns.org:/usr/obj/usr/src/sys/HOMEBELLapmipfw i386 -- Kjell