linux-kernel - Re: [PATCH] blacklist NCQ on Seagate Barracuda ST380817AS

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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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