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

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Date:	Sun, 30 Sep 2007 13:43:35 -0400
From:	Mark Lord <lkml@....ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	Mark Lord <liml@....ca>, 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

Tejun Heo wrote:
> 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.

Yeah, that's the strange bit.

Surely someone at SuSE must have a drive like that,
which they could set up with XFS and reproduce the same results?

??
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