From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: sata_nv + ADMA + Samsung disk problem Date: Wed, 02 Jan 2008 18:27:00 -0600 Message-ID: <477C2BD4.4030808@shaw.ca> References: <20070808120804.GB5257@boogie.lpds.sztaki.hu> <20080101164416.GA29574@boogie.lpds.sztaki.hu> <477B0429.7040909@gmail.com> <477B0CFD.1030603@shaw.ca> <477B10F2.9000107@shaw.ca> <477B1233.3090706@gmail.com> <477B2CE4.8070602@garzik.org> <477B318E.4030309@shaw.ca> <477B3571.6080500@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from idcmail-mo1so.shaw.ca ([24.71.223.10]:43328 "EHLO pd3mo2so.prod.shaw.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753943AbYACA14 (ORCPT ); Wed, 2 Jan 2008 19:27:56 -0500 In-reply-to: <477B3571.6080500@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Jeff Garzik , Gabor Gombas , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, kluo@nvidia.com, AMartin@nvidia.com, pchen@nvidia.com Tejun Heo wrote: > Robert Hancock wrote: >> 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. > > I agree with Jeff here. Maybe not remove but disable it by default and > when enabling warn loudly. NCQ just doesn't enough for its cost when > the cost includes erratic behaviors. Only very small fraction of error > cases actually make to bugzilla or this mailing list. > > Nvidia gents, is there anyway (be it NDA or whatever) to get Robert or > any of us technical documentation? > > Thanks. Last I heard, NVIDIA management gave the thumbs down to any more NDAs for ADMA documentation. It would be nice if they would reconsider. Apparently Jeff does have the docs, though.. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/