linux-kernel - Re: regression: 100% io-wait with 2.6.24-rcX

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Date:	Wed, 23 Jan 2008 03:12:39 -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: Wednesday, January 23, 2008 12:40:52 AM
> Subject: Re: regression: 100% io-wait with 2.6.24-rcX
> 
> On Tue, Jan 22, 2008 at 07:25:15AM -0800, Martin Knoblauch wrote:
> >   [root@...dm52 ~]# dmsetup table
> > VolGroup00-LogVol02: 0 350945280 linear 104:2 67109248
> > VolGroup00-LogVol01: 0 8388608 linear 104:2 418054528
> > VolGroup00-LogVol00: 0 67108864 linear 104:2 384
> 
> The IO should pass straight through simple linear targets like
> that without needing to get broken up, so I wouldn't expect those patches to
> make any difference in this particular case.
> 

Alasdair,

 LVM/DM are off the hook :-) I converted one box to direct using partitions and the performance is the same disappointment as with LVM/DM. Thanks anyway for looking at my problem.

 I will move the discussion now to a new thread, targetting CCISS directly. 

Cheers
Martin


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