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

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Message-ID: <aacba7e1001261649v6f5cc037h41adcf253b978386@mail.gmail.com>
Date:	Wed, 27 Jan 2010 06:19:05 +0530
From:	Vishal Rao <vishalrao@...il.com>
To:	David Rees <drees76@...il.com>
Cc:	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

2010/1/27 David Rees <drees76@...il.com>:
> So my concern is that you're proposing to black list NCQ for all users
> of those particular models of SSD when it's more likely at this point
> that it's a problem with your specific setup.

Yes, a valid concern. I guess I didn't delve more because it's working
fine on my copy of Windows 7 RC (on the same hardware) with no sign
of error logs and pretty much the same perf as Linux with NCQ forced off.

What I can do personally is plug in my SSD into my tablet PC sitting next
to me and do a few more tests and get back to you all - it could be a couple
of days. I know its still just one user (me) reporting though.

FYI I had posted on the manufacturer's website/forums (quite active with
a lot of owners) and got NO response indicating there aren't too many
Linux users with this model - again "can't prove a negative" sort of way.

In any case, the workaround (should anyone face this issue) is to simply
add " libata.force=noncq " to the kernel boot options.
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