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Date:	Thu, 17 Jan 2008 05:52:58 -0800 (PST)
From:	Martin Knoblauch <>
To:	Fengguang Wu <>
Cc:	Mike Snitzer <>,
	Peter Zijlstra <>,,
	Ingo Molnar <>,,
	"" <>,
	Linus Torvalds <>
Subject: Re: regression: 100% io-wait with 2.6.24-rcX

----- Original Message ----
> From: Fengguang Wu <>
> To: Martin Knoblauch <>
> Cc: Mike Snitzer <>; Peter Zijlstra <>;; Ingo Molnar <>;; "" <>; Linus Torvalds <>
> Sent: Wednesday, January 16, 2008 1:00:04 PM
> Subject: Re: regression: 100% io-wait with 2.6.24-rcX
> On Wed, Jan 16, 2008 at 01:26:41AM -0800, Martin Knoblauch wrote:
> > > For those interested in using your writeback improvements in
> > > production sooner rather than later (primarily with ext3); what
> > > recommendations do you have?  Just heavily test our own 2.6.24
> +
> > > evolving "close, but not ready for merge" -mm writeback patchset?
> > > 
> > Hi Fengguang, Mike,
> > 
> >  I can add myself to Mikes question. It would be good to know
> a
 "roadmap" for the writeback changes. Testing 2.6.24-rcX so far has
> been
 showing quite nice improvement of the overall writeback situation and
> it
 would be sad to see this [partially] gone in 2.6.24-final.
> Linus
 apparently already has reverted  "...2250b". I will definitely repeat my
> tests
 with -rc8. and report.
> Thank you, Martin. Can you help test this patch on 2.6.24-rc7?
> Maybe we can push it to 2.6.24 after your testing.
Hi Fengguang,

 something really bad has happened between -rc3 and -rc6. Embarrassingly I did not catch that earlier :-(

 Compared to the numbers I posted in , dd1 is now at 60 MB/sec (slight plus), while dd2/dd3 suck the same way as in pre 2.6.24. The only test that is still good is mix3, which I attribute to the per-BDI stuff.

 At the moment I am frantically trying to find when things went down. I did run -rc8 and rc8+yourpatch. No difference to what I see with -rc6. Sorry that I cannot provide any input to your patch.


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