linux-kernel - Re: PROBLEM: sata timeouts with intel 82801HB on amd64

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Message-ID: <20070208085335.5e9e16db@localhost>
Date:	Thu, 8 Feb 2007 08:53:35 +0100
From:	Paolo Ornati <ornati@...twebnet.it>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Trevor Offner Caira <toc3@...nell.edu>
Subject: Re: PROBLEM: sata timeouts with intel 82801HB on amd64

On Wed, 07 Feb 2007 22:56:45 -0600
Robert Hancock <hancockr@...w.ca> wrote:

> Paolo Ornati wrote:
> > If mounting XFS with "nobarrier" fixes the problem it seems that more
> > than one Seagate disk cannot handle the Cache Flush command while other
> > commands are in fly...
> 
> It's not allowed to overlap NCQ (FPDMA read/write) commands with any 
> other commands such as cache flushes. libata core guarantees that this 
> doesn't happen by deferring such requests until the FPDMA commands are 
> complete. (At least, it's supposed to..)

I didn't know that. Anyway just mounting XFS with "nobarrier" fixes
the ploblem for me... so libata is buggy or I don't know!

-- 
	Paolo Ornati
	Linux 2.6.20 on x86_64
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