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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.




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