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Date:	Tue, 22 Jan 2008 10:51:33 -0800 (PST)
From:	Martin Knoblauch <spamtrap@...bisoft.de>
To:	Alasdair G Kergon <agk@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>,
	Mike Snitzer <snitzer@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, jplatte@...sa.net,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	James.Bottomley@...eleye.com, Jens Axboe <jens.axboe@...cle.com>,
	Milan Broz <mbroz@...hat.com>, Neil Brown <neilb@...e.de>
Subject: Re: regression: 100% io-wait with 2.6.24-rcX

----- Original Message ----
> From: Alasdair G Kergon <agk@...hat.com>
> To: Martin Knoblauch <spamtrap@...bisoft.de>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>; Mel Gorman <mel@....ul.ie>; Fengguang Wu <wfg@...l.ustc.edu.cn>; Mike Snitzer <snitzer@...il.com>; Peter Zijlstra <peterz@...radead.org>; jplatte@...sa.net; Ingo Molnar <mingo@...e.hu>; linux-kernel@...r.kernel.org; "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>; James.Bottomley@...eleye.com; Jens Axboe <jens.axboe@...cle.com>; Milan Broz <mbroz@...hat.com>; Neil Brown <neilb@...e.de>
> Sent: Tuesday, January 22, 2008 3:39:33 PM
> Subject: Re: regression: 100% io-wait with 2.6.24-rcX
> 
> 
> See if these patches make any difference:
> 
  http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/
> 
>     dm-md-merge_bvec_fn-with-separate-bdev-and-sector.patch
>     dm-introduce-merge_bvec_fn.patch
>     dm-linear-add-merge.patch
>     dm-table-remove-merge_bvec-sector-restriction.patch
>  


 nope. Exactely the same poor results. To rule out LVM/DM I really have to see what happens if I setup a system with filesystems directly on partitions. Might take some time though.

Cheers
Martin



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