From mboxrd@z Thu Jan 1 00:00:00 1970 From: Calvin Walton Subject: Re: Spurious completions during NCQ Date: Fri, 15 Feb 2008 10:00:00 -0500 Message-ID: <1203087600.25150.5.camel@zem> References: <20080215134658.GB27745@vlad.carfax.org.uk> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from py-out-1112.google.com ([64.233.166.176]:2674 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758118AbYBOPAJ (ORCPT ); Fri, 15 Feb 2008 10:00:09 -0500 Received: by py-out-1112.google.com with SMTP id u52so903495pyb.10 for ; Fri, 15 Feb 2008 07:00:08 -0800 (PST) In-Reply-To: <20080215134658.GB27745@vlad.carfax.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Hugo Mills Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org On Fri, 2008-02-15 at 13:46 +0000, Hugo Mills wrote: > I'm getting these on my Dell Latitude D830: > > Feb 15 13:06:00 willow kernel: ata1.00: exception Emask 0x2 SAct 0x4 SErr 0x0 action 0x2 frozen > Feb 15 13:06:00 willow kernel: ata1.00: spurious completions during NCQ issue=0x0 SAct=0x4 FIS=004040a1:00000002 > In some cases, there are several cmd/res lines listed. It's > happening about once an hour or so (not correlated with any other > event that I can see). It doesn't seem to be affecting operation of > the machine, but it's making me nervous. > > Can anyone set my mind at rest? (Or suggest a fix?) You didn't mention which SATA chipset your laptop has, but some quick googling says that it's AHCI. Until 2.6.24, the AHCI driver has a problem where it'll report superious NCQ completions due to a bug in the driver logic. > uname -a reports: > Linux willow 2.6.23.1-hrt3 #1 SMP Sun Nov 4 14:51:20 GMT 2007 x86_64 GNU/Linux The fix is simple, upgrade your kernel to 2.6.24 :) > It's a kernel.org kernel with the patch for tickless operation on > amd64. Handily, the 2.6.24 kernel.org kernel includes amd64 tickless support already. -- Calvin Walton