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Message-ID: <46FFDCE5.4060900@gmail.com>
Date: Sun, 30 Sep 2007 10:29:09 -0700
From: Tejun Heo <htejun@...il.com>
To: Mark Lord <liml@....ca>
CC: Jeff Garzik <jeff@...zik.org>, Paolo Ornati <ornati@...twebnet.it>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-ide@...r.kernel.org
Subject: Re: [PATCH] blacklist NCQ on Seagate Barracuda ST380817AS
Mark Lord wrote:
> Jeff Garzik wrote:
>> Paolo Ornati wrote:
>>> I have this problem only with XFS, and even with XFS it goes away
>>> mounting with "nobarrier"...
>>
>> This last is an interesting datapoint.
>>
>> I wonder if libata has a generic problem with NCQ + FLUSH CACHE.
>
> Yeah, that's pretty suspicious. Prior to issuing a FLUSH_CACHE op,
> one must first drain all outstanding NCQ commands (and not issue new ones).
>
> I'm sure the code must *try* to do that, but perhaps there's a bug in
> there?
> Or just another drive bug?
If there was such a bug, the aborted commands list should contain both
FPDMA commands and FLUSH commands. I don't think command filtering
itself is broken. Possibly another quirky firmware but it's strange
that this is the only Seagate drive showing this problem.
Thanks.
--
tejun
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