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

[Martin Knoblauch]

----- 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: 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@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
> 
> 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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