From owner-freebsd-scsi Wed Feb 18 15:46:27 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA14036 for freebsd-scsi-outgoing; Wed, 18 Feb 1998 15:46:27 -0800 (PST) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from pluto.plutotech.com (mail.plutotech.com [206.168.67.137]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA13934 for ; Wed, 18 Feb 1998 15:45:56 -0800 (PST) (envelope-from gibbs@plutotech.com) Received: from narnia.plutotech.com (narnia.plutotech.com [206.168.67.130]) by pluto.plutotech.com (8.8.7/8.8.5) with ESMTP id QAA02707; Wed, 18 Feb 1998 16:45:45 -0700 (MST) Message-Id: <199802182345.QAA02707@pluto.plutotech.com> X-Mailer: exmh version 2.0.1 12/23/97 To: Tom cc: "Justin T. Gibbs" , Wee Teck Ng , freebsd-scsi@FreeBSD.ORG Subject: Re: very slow scsi performance In-reply-to: Your message of "Wed, 18 Feb 1998 15:22:20 PST." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 18 Feb 1998 16:42:54 -0700 From: "Justin T. Gibbs" Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >> drives are behaving completely within the bounds of the SCSI spec. CAM >> handles this "problem" by honoring the DQUE bit assuming that the user >> knows what they are doing. > > Wait a second... that means that those drives don't support tags at all? >Now I'm sure that I don't want IBM drives. I think you should go read the SCSI spec. DQUE means that the user has disabled tagged queuing. If you edit the mode page and turn the bit off, tags work great. >Tom -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message