Date: Fri, 15 Feb 2008 15:04:50 +0000
From: Hugo Mills <hugo@carfax.org.uk>
To: Calvin Walton <calvin.walton@gmail.com>
Cc: Hugo Mills <hugo-lkml@carfax.org.uk>, linux-kernel@vger.kernel.org,
       linux-ide@vger.kernel.org
Subject: Re: Spurious completions during NCQ
Message-ID: <20080215150449.GC27745@vlad.carfax.org.uk>
Mail-Followup-To: Hugo Mills <hugo@carfax.org.uk>,
	Calvin Walton <calvin.walton@gmail.com>,
	Hugo Mills <hugo-lkml@carfax.org.uk>, linux-kernel@vger.kernel.org,
	linux-ide@vger.kernel.org
References: <20080215134658.GB27745@vlad.carfax.org.uk> <1203087600.25150.5.camel@zem>
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	Content preview:  On Fri, Feb 15, 2008 at 10:00:00AM -0500, Calvin Walton wrote:
	> 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 :) [...] 
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On Fri, Feb 15, 2008 at 10:00:00AM -0500, Calvin Walton wrote:
> 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 :)

   Excellent. Thank you for clearing this up for me. I'll head off and
do the upgrade now.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
    --- All mushrooms are edible,  but some are only edible once. ---    

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