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

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Message-Id: <200701191453.12482.s0348365@sms.ed.ac.uk>
Date:	Fri, 19 Jan 2007 14:53:12 +0000
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Björn Steinbrink <B.Steinbrink@....de>,
	jeff@...zik.org, linux-kernel@...r.kernel.org, htejun@...il.com,
	jens.axboe@...cle.com
Subject: Re: SATA exceptions with 2.6.20-rc5

On Tuesday 16 January 2007 00:34, 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..

I have exactly the same problem on -rc5 and it causes all I/O to stall 
periodically if I do _anything_ I/O intensive.

On my box, I have 4 sata_nv handled SATA ports, with two pairs of different 
drives (two Maxtor, two WD) and it happens randomly on both. So it's 
absolutely nothing to do with the drive make/model.

I'll try Jeff's suggestion of disabling ADMA now, but I think something more 
radical than this workaround should make it into 2.6.20 final, otherwise a 
lot of people are going to have broken boxes.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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