linux-kernel - Re: SATA exceptions with 2.6.20-rc5

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Date:	Sat, 20 Jan 2007 05:15:40 +0100
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Alistair John Strachan <s0348365@....ed.ac.uk>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	htejun@...il.com, jens.axboe@...cle.com, lwalton@...l.com
Subject: Re: SATA exceptions with 2.6.20-rc5

On 2007.01.19 20:41:36 -0600, Robert Hancock wrote:
> Alistair John Strachan wrote:
> >On Tuesday 16 January 2007 01:53, Jeff Garzik wrote:
> >>Robert Hancock wrote:
> >>>I'll try your stress test when I get a chance, but I doubt I'll run into
> >>>the same problem and I haven't seen any similar reports. Perhaps it's
> >>>some kind of wierd timing issue or incompatibility between the
> >>>controller and that drive when running in ADMA mode? I seem to remember
> >>>various reports of issues with certain Maxtor drives and some nForce
> >>>SATA controllers under Windows at least..
> >>Just to eliminate things, has disabling ADMA been attempted?
> >>
> >>It can be disabled using the sata_nv.adma module parameter.
> >
> >Setting this option fixes the problem for me. I suggest that ADMA defaults 
> >off in 2.6.20, if there's still time to do that.
> >
> 
> Can you guys that are having this problem try the attached debug patch? 
> It's possible it will fix the problem, as I'm trying a private 
> exec_command implementation that flushes the write by reading a 
> controller register instead of reading altstatus from the drive like the 
> libata core code does.

Will give it a spin in about an hour.

> If the problem still happens, I also added some more debugging in to 
> help figure out what is going on, so please post full dmesg.
> 
> By the way, I assume that you guys are using reiserfs or xfs, as it 
> appears no other file systems issue flush commands automatically. I had 
> to test this by "echo 1 > delete" on the SCSI disk in sysfs, as I am 
> using ext3.

No, ext3 here, on top of md RAID1 and LVM. Oh, and one ext2, I wonder
where that comes from...

Björn
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