Date: Fri, 15 Oct 1999 11:12:01 -0400 (EDT) From: "Chris D. Faulhaber" <cdf.lists@fxp.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: "Kenneth D. Merry" <ken@kdm.org>, scsi@FreeBSD.ORG Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 Message-ID: <Pine.BSF.4.10.9910151109140.98623-100000@pawn.primelocation.net> In-Reply-To: <14343.16009.738375.608477@grasshopper.cs.duke.edu>
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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: <WDIGTL WDE4360-1807A3 1.80> Fixed Direct Access SCSI-2 device > pass0: Serial Number WS7010610507 > pass0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit) > > pass1: <WDIGTL ENTERPRISE 1.91> 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: <WDIGTL WDE9100 1.50> 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 <jedgar@fxp.org> | 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
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