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

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Message-ID: <be3a4a1001281212h73ba1bd5ja8e275679f3554d7@mail.gmail.com>
Date:	Thu, 28 Jan 2010 15:12:07 -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 Wed, Jan 27, 2010 at 11:14 AM, Vishal Rao <vishalrao@...il.com> wrote:
> 2010/1/27 Jarod Wilson <jarod@...sonet.com>:
>> 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.
>
> Thanks for data point. I'm personally hoping for other Crucial users
> specifically.
>
> Is NCQ enabled - if you grep dmesg for ata ?

$ dmesg | grep -i ncq
ahci 0000:00:0b.0: flags: 64bit ncq sntf led pmp pio slum part sxs
ata1.00: 62533296 sectors, multi 16: LBA48 NCQ (depth 31/32), AA


> The kernel already appears to blacklist (disable NCQ for) OCZ
> SSD models with firmware version "02.10104".

Here's what I've got:

ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-7: OCZ-VERTEX 1275, 00.P97, max UDMA/133
ata1.00: 62533296 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
ata1.00: configured for UDMA/133
scsi 0:0:0:0: Direct-Access     ATA      OCZ-VERTEX 1275  00.P PQ: 0 ANSI: 5


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