linux-kernel - Re: sata_nv + ADMA + Samsung disk problem

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Message-id: <477B318E.4030309@shaw.ca>
Date:	Wed, 02 Jan 2008 00:39:10 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Tejun Heo <htejun@...il.com>, Gabor Gombas <gombasg@...aki.hu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	kluo@...dia.com, AMartin@...dia.com, pchen@...dia.com
Subject: Re: sata_nv + ADMA + Samsung disk problem

Jeff Garzik wrote:
> Tejun Heo wrote:
>> Thanks a lot for the detailed explanation.  Nvidia ppl, any ideas?
>> FLUSH is used regularly.  We really need to fix this.
> 
> 
> I reiterate my opinion :)  ...   We should remove ADMA support from 
> sata_nv.  It's only in a few chips, it's not appearing in any new chips, 
> and nasty problems have lingered since ADMA support was introduced.
> 
> Definitely sounds like we should disable ADMA by default for 2.6.24-rc, 
> too.

I wouldn't agree.. It's only in a few chips (CK804/MCP04), but those 
chips are very common in desktop, workstation, even some server 
machines. Given the huge number of these chips out there, problem 
reports have been quite rare.
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