Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753615AbYABRgG (ORCPT ); Wed, 2 Jan 2008 12:36:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751000AbYABRfz (ORCPT ); Wed, 2 Jan 2008 12:35:55 -0500 Received: from hqemgate04.nvidia.com ([216.228.112.152]:16829 "EHLO hqemgate04.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750823AbYABRfy convert rfc822-to-8bit (ORCPT ); Wed, 2 Jan 2008 12:35:54 -0500 X-PGP-Universal: processed; by hqnvupgp04.nvidia.com on Wed, 02 Jan 2008 09:35:44 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 MIME-Version: 1.0 Subject: RE: sata_nv + ADMA + Samsung disk problem Date: Wed, 2 Jan 2008 09:23:29 -0800 Message-ID: In-Reply-To: <477B0CFD.1030603@shaw.ca> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: sata_nv + ADMA + Samsung disk problem Thread-Index: AchM9GiIdZy8ZfBlQnWUdJGjzhp8uQAb386A References: <20070808120804.GB5257@boogie.lpds.sztaki.hu> <20080101164416.GA29574@boogie.lpds.sztaki.hu> <477B0429.7040909@gmail.com> <477B0CFD.1030603@shaw.ca> From: "Allen Martin" To: "Robert Hancock" , "Tejun Heo" Cc: "Gabor Gombas" , , , "Kuan Luo" , "Peer Chen" X-OriginalArrivalTime: 02 Jan 2008 17:23:29.0959 (UTC) FILETIME=[31521370:01C84D64] Content-class: urn:content-classes:message Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1354 Lines: 27 > The question I had for NVIDIA regarding this that I never got > answered > was, is there any reason why we would need a delay when switching > between NCQ and non-NCQ commands on ADMA, and if not, is > there any known > cause that could cause the controller to get into this seemingly > locked-up state? When switching from NCQ to non NCQ or vice versa you must make sure all outstanding commands are completed before issuing the new command. The hardware doesn't do anything to prevent queued and non queued commands from going out on the wire at the same time which will certainly cause some drives to fail. -Allen ----------------------------------------------------------------------------------- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. ----------------------------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/