linux-kernel - Re: [PATCH] ata: Disable NCQ for Crucial M225 brand SSDs

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Date:	Wed, 27 Jan 2010 10:39:16 -0500
From:	Jarod Wilson <jarod@...sonet.com>
To:	Vishal Rao <vishalrao@...il.com>
Cc:	David Rees <drees76@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org, stable@...nel.org
Subject: Re: [PATCH] ata: Disable NCQ for Crucial M225 brand SSDs

On Tue, Jan 26, 2010 at 7:21 PM, Vishal Rao <vishalrao@...il.com> wrote:
> 2010/1/27 David Rees <drees76@...il.com>:
>> Have there been any other reports of NCQ issues with similar Crucial
>> drives or Indilinx?
>
> I haven't personally seen reports of NCQ specific issues. I have seen
> people (online) reporting "issues" with Linux distro installations
> hanging/freezing etc. and some prior attempts at SMART fixes which
> I also initially tried but did not work for me.
>
> I have tried to "publicise" this issue (forum, blog, mailing list posts)
> in the hope more users may search and identify the correct issue
> so that it may be better verified.
>
> Unfortunately, the Crucial ID string is not model-agnostic (if thats
> the right term)... meaning the patch has 3 lines to ID the 3 current
> models that I know of including my own 128 GB model.
>
> Not sure if there's a better, more generic way to match a whole group
> of SSDs (same model family or various vendors) which trigger NCQ errors?

How to define a group gets... Messy. Just as a data point, my own
Barefoot-based SSD, an OCZ Vertex, has no NCQ-related problems
whatsoever, so far as I know. Its currently hooked to a Zotac ION
board, which has ahci-driven sata controllers of some sort, was
previously in a Dell Studio Hybrid, where it also worked just fine.

-- 
Jarod Wilson
jarod@...sonet.com
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