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

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Message-ID: <20080122234051.GP8075@agk.fab.redhat.com>
Date:	Tue, 22 Jan 2008 23:40:52 +0000
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>
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
-- 
agk@...hat.com
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