From owner-freebsd-scsi Fri Oct 15 8:13:19 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from pawn.primelocation.net (pawn.primelocation.net [205.161.238.235]) by hub.freebsd.org (Postfix) with ESMTP id 358D215245 for ; Fri, 15 Oct 1999 08:12:09 -0700 (PDT) (envelope-from cdf.lists@fxp.org) Received: by pawn.primelocation.net (Postfix, from userid 1016) id A7DC19B23; Fri, 15 Oct 1999 11:12:01 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by pawn.primelocation.net (Postfix) with ESMTP id 9E5F3BA1C; Fri, 15 Oct 1999 11:12:01 -0400 (EDT) Date: Fri, 15 Oct 1999 11:12:01 -0400 (EDT) From: "Chris D. Faulhaber" X-Sender: cdf.lists@pawn.primelocation.net To: Andrew Gallatin Cc: "Kenneth D. Merry" , scsi@FreeBSD.ORG Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 In-Reply-To: <14343.16009.738375.608477@grasshopper.cs.duke.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 15 Oct 1999, Andrew Gallatin wrote: > I'm the guy to blame for this quirk. My drives (shipped in about 60 > older Dell Dimension XPS D300 here) have abysmal sequential write > performance with tagged queuing enabled. There are two types of > identifiers: > > pass0: Fixed Direct Access SCSI-2 device > pass0: Serial Number WS7010610507 > pass0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit) > > pass1: Fixed Direct Access SCSI-2 device > pass1: Serial Number WS7011244369 > pass1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit) > > >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? > I can agree with this. I have the following: da0: Fixed Direct Access SCSI-2 device da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit) da0: 8683MB (17783204 512 byte sectors: 255H 63S/T 1106C) After enabling tagged queuing on this drive (by removing the quirk entry) and found performance about 10% slower. ----- Chris D. Faulhaber | All the true gurus I've met never System/Network Administrator, | claimed they were one, and always Reality Check Information, Inc. | pointed to someone better. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message