linux-kernel - Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

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Message-ID: <471494A1.8030504@linux.vnet.ibm.com>
Date:	Tue, 16 Oct 2007 16:08:25 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Frans Pop <elendil@...net.nl>
CC:	Christian Borntraeger <borntraeger@...ibm.com>,
	Chuck Ebbert <cebbert@...hat.com>, Greg KH <greg@...ah.com>,
	stable@...nel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

Frans Pop wrote:
> On Tuesday 16 October 2007, Balbir Singh wrote:
>> I am trying to think out loud as to what the root cause of the problem
>> might be. In one of the discussion threads, I saw utime going backwards,
>> which seemed very odd, I suspect that those are rounding errors.
> 
> I only remembered stime going backwards, but looking back at the mails
> you are right, there has been one case of utime going backwards too.
> stime going backwards happens _much_ more frequently.
> 
>> I have tried and not had any success reproducing the problem, could you
>> please help me with some pointers/steps to reproduce the problem?
> 
> I can reproduce the problem reliably for two KDE programs I have running
> permanently on my system: kontact and amarok. Both of these wake up
> regularly and use some (not very much) processor capacity before going to
> sleep again. Any process that has that that characteristic should do.
> 
> /me thinks a bit and tries something
> 
> lol - I have just managed to reproduce this with 'top' itself :-P
> 

Thanks, I know why I am not seeing the problem. My box has
CONFIG_VIRT_CPU_ACCOUNTING set. I'll find another box and try.



-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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