From: Jeff Garzik <jeff@garzik.org>
To: Robert Hancock <hancockrwd@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
ide <linux-ide@vger.kernel.org>, Mike Cui <cuicui@gmail.com>,
Peer Chen <pchen@nvidia.com>, Allen Martin <AMartin@nvidia.com>
Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI
Date: Sat, 13 Feb 2010 18:02:12 -0500 [thread overview]
Message-ID: <4B772F74.1030509@garzik.org> (raw)
In-Reply-To: <51f3faa71002131453m4dd2b82cgd8b874866146da60@mail.gmail.com>
On 02/13/2010 05:53 PM, Robert Hancock wrote:
> On Sat, Feb 13, 2010 at 4:46 PM, Jeff Garzik<jeff@garzik.org> wrote:
>> On 01/26/2010 11:33 PM, Robert Hancock wrote:
>>>
>>> Mike Cui reported that his system with an NVIDIA MCP79 (aka MCP7A) chipset
>>> stopped working with 2.6.32. The problem appears to be that 2.6.32 now
>>> enables
>>> the FPDMA auto-activate optimization in the ahci driver. The drive works
>>> fine
>>> with this enabled on an Intel AHCI so this appears to be a chipset bug.
>>> Since MCP79 is a fairly recent NVIDIA chipset and we don't have any info
>>> on
>>> whether any other NVIDIA chipsets have this issue, disable FPDMA AA
>>> optimization
>>> on all NVIDIA AHCI controllers for now.
>>>
>>> Should address http://bugzilla.kernel.org/show_bug.cgi?id=14922
>>>
>>> Signed-off-by: Robert Hancock<hancockrwd@gmail.com>
>>>
>>> ---
>>>
>>> Mike, can you test this out and make sure this resolves the problem for
>>> you?
>>
>> Sigh... we never did hear back from Mike or NVIDIA on this one, did we?
>> I've been watching for a response, and haven't seen one to date.
>
> No, I haven't seen a response. It's pretty apparent it should fix the
> problem based on earlier testing, but it would be nice to find out for
> sure which chipsets this affects.
Yep, that's my main concern... being overly aggressive and zapping it
on all NVIDIA chipsets, even future ones.
Jeff
next prev parent reply other threads:[~2010-02-13 23:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-27 4:33 [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI Robert Hancock
2010-01-31 17:10 ` Robert Hancock
2010-02-13 22:46 ` Jeff Garzik
2010-02-13 22:53 ` Robert Hancock
2010-02-13 23:02 ` Jeff Garzik [this message]
2010-02-15 18:34 ` Robert Hancock
2010-02-16 22:46 ` Prajakta Gudadhe
2010-02-24 0:39 ` Robert Hancock
2010-02-25 3:45 ` Jeff Garzik
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