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

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Date:	Wed, 07 Feb 2007 22:56:45 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Paolo Ornati <ornati@...twebnet.it>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Trevor Offner Caira <toc3@...nell.edu>
Subject: Re: PROBLEM: sata timeouts with intel 82801HB on amd64

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..)

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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