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Date:      Tue, 14 Dec 1999 23:20:03 -0800 (PST)
From:      "Kenneth D. Merry" <ken@kdm.org>
To:        freebsd-bugs@FreeBSD.org
Subject:   Re: kern/15447: Seagate ST32550 (Barracuda 2LP) may be a broken tagged queueing drive?
Message-ID:  <199912150720.XAA67807@freefall.freebsd.org>

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The following reply was made to PR kern/15447; it has been noted by GNATS.

From: "Kenneth D. Merry" <ken@kdm.org>
To: Ken Harrenstien <klh@netcom.com>
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/15447: Seagate ST32550 (Barracuda 2LP) may be a broken tagged queueing drive?
Date: Wed, 15 Dec 1999 00:13:04 -0700

 On Tue, Dec 14, 1999 at 04:58:33 -0800, Ken Harrenstien wrote:
 > Because of your statement that the ST32550 is known to work, and the
 > fact that my Fujitsu was failing in the same way, I don't think the
 > drives are at fault.  So we're left with either the controller, or
 > FreeBSD 3.1's support of it, or something else.  The controller seems
 > unlikely since Tagged Queueing is a higher-level protocol and there's
 > no reason to suspect either the physical bus or the link-level
 > protocol (otherwise many more problems would have evinced themselves).
 > 
 > One more data point.  I use the same kernel source base in another
 > system (NCR 53c895, 3 IBM drives) where all drives are TQ-enabled and
 > have never had problems despite much heavier usage.
 > 
 > I'm starting to think that whatever is causing the kernel to be
 > spastic about whether or not to use Tagged Queueing (cf kern/15446)
 > may also be responsible for its failure to operate properly.  In any
 > case, since the ST32550 is no longer a suspect, I suggest that this
 > bug (kern/15447) be closed and the above information made a follow-up
 > to kern/15446.
 
 Thanks for all the detailed information.  Based on PR kern/15447, I think
 we can close this and assume for now that this is a problem with Tekram's
 amd driver.
 
 Ken
 -- 
 Kenneth Merry
 ken@kdm.org
 


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