From owner-freebsd-questions@FreeBSD.ORG Sat Mar 5 10:43:54 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 58A0E16A4CE for ; Sat, 5 Mar 2005 10:43:54 +0000 (GMT) Received: from av2-1-sn3.vrr.skanova.net (av2-1-sn3.vrr.skanova.net [81.228.9.107]) by mx1.FreeBSD.org (Postfix) with ESMTP id 09C3543D2D for ; Sat, 5 Mar 2005 10:43:54 +0000 (GMT) (envelope-from homebell@telia.com) Received: by av2-1-sn3.vrr.skanova.net (Postfix, from userid 502) id D625037E50; Sat, 5 Mar 2005 11:43:52 +0100 (CET) Received: from smtp1-1-sn3.vrr.skanova.net (smtp1-1-sn3.vrr.skanova.net [81.228.9.177]) by av2-1-sn3.vrr.skanova.net (Postfix) with ESMTP id C95AF37E48 for ; Sat, 5 Mar 2005 11:43:52 +0100 (CET) Received: from [192.168.0.3] (h138n2fls31o930.telia.com [217.210.244.138]) by smtp1-1-sn3.vrr.skanova.net (Postfix) with ESMTP id B30B73800F for ; Sat, 5 Mar 2005 11:43:52 +0100 (CET) Message-ID: <42298D68.705@telia.com> Date: Sat, 05 Mar 2005 11:43:52 +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: freebsd-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; format=flowed Content-Transfer-Encoding: 7bit Subject: ATA Tagged Queuing? (2nd attempt to get an answer) 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: Sat, 05 Mar 2005 10:43:54 -0000 I sent the below question a month ago, but received no answer. Therefore, I resend it in the hope of getting one now. ---------- 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