From owner-freebsd-hackers Mon Oct 28 18:32:42 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BFF7C37B401 for ; Mon, 28 Oct 2002 18:32:41 -0800 (PST) Received: from aaz.links.ru (aaz.links.ru [193.125.152.37]) by mx1.FreeBSD.org (Postfix) with ESMTP id DA97243E7B for ; Mon, 28 Oct 2002 18:32:40 -0800 (PST) (envelope-from babolo@aaz.links.ru) Received: from aaz.links.ru (aaz.links.ru [193.125.152.37]) by aaz.links.ru (8.12.6/8.12.6) with ESMTP id g9T2XDDh033712; Tue, 29 Oct 2002 05:33:13 +0300 (MSK) (envelope-from babolo@aaz.links.ru) Received: (from babolo@localhost) by aaz.links.ru (8.12.6/8.12.6/Submit) id g9T2XDDw033711; Tue, 29 Oct 2002 05:33:13 +0300 (MSK) Message-Id: <200210290233.g9T2XDDw033711@aaz.links.ru> Subject: Re: [hardware] Tagged Command Queuing or Larger Cache ? X-ELM-OSV: (Our standard violations) hdr-charset=KOI8-R; no-hdr-encoding=1 In-Reply-To: <20021029095553.N91719-100000@squirm.dsto.defence.gov.au> To: Alex.Wilkinson@dsto.defence.gov.au Date: Tue, 29 Oct 2002 05:33:11 +0300 (MSK) From: "."@babolo.ru Cc: hackers@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL99b (25)] MIME-Version: 1.0 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > Howdy Crew, > > I am about to buy a new hard disk for my FreeBSD work station. > Since FreeBSD's ATA drivers implement Tagged Command Queuing and IBM make > the only ATA disks that implement tagged command queuing ( ie since the 60GXP family ), > an IBM 40GB 120GXP "looks like" the best solution. > > However, my question is: > > Do the benifits from a having a larger disk cache such as the "WD 40GB 7200RPM w/8MB Cache" > has, outweigh the benefits of Tagged Command Queuing ? As far as I know big cashe helps for one I/O thread, and Tagged Queuing helps more in multiple I/O threads. The first series of Tagged Queuing drive was far before 60GXP - it was DPTA. Then DLTA (I used this hardly, some of them was slightly buggy) -- @BABOLO http://links.ru/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message