From owner-freebsd-scsi Fri Oct 15 10:15: 2 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id CC4EE14D95 for ; Fri, 15 Oct 1999 10:14:58 -0700 (PDT) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id LAA50233; Fri, 15 Oct 1999 11:14:54 -0600 (MDT) (envelope-from ken) Message-Id: <199910151714.LAA50233@panzer.kdm.org> Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 In-Reply-To: <14343.16009.738375.608477@grasshopper.cs.duke.edu> from Andrew Gallatin at "Oct 15, 1999 11:00:16 am" To: gallatin@cs.duke.edu (Andrew Gallatin) Date: Fri, 15 Oct 1999 11:14:54 -0600 (MDT) Cc: scsi@FreeBSD.ORG From: "Kenneth D. Merry" X-Mailer: ELM [version 2.4ME+ PL54 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Andrew Gallatin wrote... > >From the reports I've seen, it looks like Western Digital got their > act together and their Ultra2 drives are OK. Could we make the quirk > entry enable tagged queuing for Ultra2 WDE drives & disable it for > non-ultra2 drives? It would be tricky, since they seem have just added "ULTRA2" on the end of the device string. And it isn't worth changing the quirk without a full round of tests from someone with one of these disks. > Also, would it be possible to enable/disable tagged queuing from > camcontrol? Or to read the quirks from a config file (like Digital > UNIX does with its ddr.db file..). camcontrol negotiate allows you to temporarily enable/disable tagged queueing. If you set the DQue bit in mode page 10, it'll make the change permanent. Quirk entries are another matter altogether. In some cases, you'd probably rather have them read by the boot loader than camcontrol. It'll take a reasonable amount of design work to get an implementation that'll work correctly. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message