linux-kernel - Re: Regression with idle cpu cycle handling in 2.6.24 (compared to 2.6.22)

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Message-ID: <20080120040339.GB16692@linux.vnet.ibm.com>
Date:	Sun, 20 Jan 2008 09:33:39 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	dAniel hAhler <dhahler@...glemail.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Regression with idle cpu cycle handling in 2.6.24 (compared to
	2.6.22)

On Sun, Jan 20, 2008 at 09:03:38AM +0530, Dhaval Giani wrote:
> On Sat, Jan 19, 2008 at 03:52:44PM +0100, dAniel hAhler wrote:
> > Hello,
> > 
> > I've now found the reason and a workaround for this. Apparently, it's
> > related to CONFIG_FAIR_USER_SCHED and can be worked around by
> > assigning a really small value to the boinc users cpu_share (125 is
> > the uid of "boinc"):
> > $ echo 2 | sudo tee /sys/kernel/uids/125/cpu_share
> > 
> 
> Correct, that is the way to go about it.
> 
> > While looking around, I've found the following patch, which seems to
> > address this:
> > http://www.ussg.iu.edu/hypermail/linux/kernel/0710.3/3849.html
> > 
> > It has been posted here, but without any response.
> > 
> > btw: writing 1 into "cpu_share" totally locks up the computer!
> > 
> 
> Can you please provide some more details. Can you go into another
> console (try ctrl-alt-f1) and try to reproduce the issue there. Could
> you take a photo of the oops/panic and upload it somewhere so that we
> can see it?
> 

I've not been able to reproduce this problem on my system here. Do you
try to change the cpu_share of the current user?

-- 
regards,
Dhaval
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