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Date:	Tue, 22 Jan 2008 14:39:33 +0000
From:	Alasdair G Kergon <>
To:	Martin Knoblauch <>
Cc:	Linus Torvalds <>,
	Mel Gorman <>,
	Fengguang Wu <>,
	Mike Snitzer <>,
	Peter Zijlstra <>,,
	Ingo Molnar <>,,
	"" <>,, Jens Axboe <>,
	Milan Broz <>, Neil Brown <>
Subject: Re: regression: 100% io-wait with 2.6.24-rcX

On Fri, Jan 18, 2008 at 11:01:11AM -0800, Martin Knoblauch wrote:
>  At least, rc1-rc5 have shown that the CCISS system can do well. Now
> the question is which part of the system does not cope well with the
> larger IO sizes? Is it the CCISS controller, LVM or both. I am open to
> suggestions on how to debug that. 

What is your LVM device configuration?
  E.g. 'dmsetup table' and 'dmsetup info -c' output.
Some configurations lead to large IOs getting split up on the way through

See if these patches make any difference:

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