linux-kernel - Re: 2.6.26-rc9: Reported regressions from 2.6.25

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Message-ID: <20080707173708.GA3000@elf.ucw.cz>
Date:	Mon, 7 Jul 2008 19:37:08 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maximilian Engelhardt <maxi@...monizer.de>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: 2.6.26-rc9: Reported regressions from 2.6.25

Hi!

> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=10919
> > Subject		: [regression] display dimming is slow and laggy - Acer Travelmate 661lci
> > Submitter	: Maximilian Engelhardt <maxi@...monizer.de>
> > Date		: 2008-06-14 22:31 (23 days old)
> > References	: http://marc.info/?l=linux-kernel&m=121348428828320&w=4
> 
> I wonder if this one could be related. The 'nr_zones' overwriting bug 
> would result in kswapd not reclaiming any memory asynchronously, so the 
> kernel would basically be constantly under a low-memory situation, and 
> processes would be forced to do synchronous reclaim. 
> 
> That, in turn, could easily explain laggy operation, especially if it is 
> something bigger that needs to allocate new memory (not that I know if X 
> dimming needs to, but I could imagine that it does some double buffering 
> or whatever).

Hmm, but that would mean whole system is slow, right?

I'd bet this is ACPI EC problem...
									Pavel
-- 
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