linux-kernel - Re: Performance regression in scsi sequential throughput (iozone) due to "e084b - page-allocator: preserve PFN ordering when __GFP

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Message-ID: <20100226111823.GI9738@laptop>
Date:	Fri, 26 Feb 2010 22:18:23 +1100
From:	Nick Piggin <npiggin@...e.de>
To:	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	epasch@...ibm.com, SCHILLIG@...ibm.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	christof.schmitt@...ibm.com, thoss@...ibm.com, hare@...e.de,
	gregkh@...ell.com
Subject: Re: Performance regression in scsi sequential throughput (iozone)
 due to "e084b - page-allocator: preserve PFN ordering when	__GFP_COLD
 is set"

On Thu, Feb 25, 2010 at 04:13:52PM +0100, Christian Ehrhardt wrote:
> Christian Ehrhardt wrote:
> FIN)
> So, thats it from my side.
> I look forward to the finalized congestion_wait->zone wait patch however
> this turns out (zone wait is resonable if fixing this symptom or not in
> my opinion).
> But still I have a small amount of hope left that all the data I found here
> might give someone the kick to see whats going on in mm's backstage due to
> that patches.

Hi Christian,

Thanks for doing all this work. I've been looking at a couple of other
regressions while it seemed like you guys were making progress. I can't
seem to reproduce it on my x86-64 system (was anybody able to reproduce
it on x86?)

Anyway I have asked our mainframe guy whether we can set up an
environment.

I agree it is a real problem that really needs to be properly explained.

Thanks,
Nick

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