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

[Martin Knoblauch]

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

----- Original Message ----
> From: Alasdair G Kergon <agk@xxxxxxxxxx>
> To: Martin Knoblauch <spamtrap@xxxxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>; Mel Gorman <mel@xxxxxxxxx>; Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>; Mike Snitzer <snitzer@xxxxxxxxx>; Peter Zijlstra <peterz@xxxxxxxxxxxxx>; jplatte@xxxxxxxxx; Ingo Molnar <mingo@xxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>; James.Bottomley@xxxxxxxxxxxx; Jens Axboe <jens.axboe@xxxxxxxxxx>; Milan Broz <mbroz@xxxxxxxxxx>; Neil Brown <neilb@xxxxxxx>
> 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@lpsdm52 ~]# 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@lpsdm52 ~]# 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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