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Date:	Tue, 22 Jan 2008 07:25:15 -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


------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www:   http://www.knobisoft.de

----- 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
> 
> 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
> device-mapper.
>
Hi Alastair,

 here is the output, the filesystem in question is on LogVol02:

  [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
[root@...dm52 ~]# dmsetup info -c
Name             Maj Min Stat Open Targ Event  UUID
VolGroup00-LogVol02 253   1 L--w    1    1      0 LVM-IV4PeE8cdxA3piC1qk79GY9PE9OC4OgmOZ4OzOgGQIdF3qDx6fJmlZukXXLIy39R
VolGroup00-LogVol01 253   2 L--w    1    1      0 LVM-IV4PeE8cdxA3piC1qk79GY9PE9OC4Ogmfn2CcAd2Fh7i48twe8PZc2XK5bSOe1Fq
VolGroup00-LogVol00 253   0 L--w    1    1      0 LVM-IV4PeE8cdxA3piC1qk79GY9PE9OC4OgmfYjxQKFP3zw2fGsezJN7ypSrfmP7oSvE

> 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
>  

 thanks for the suggestion. Are they supposed to apply to mainline?

Cheers
Martin



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