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

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Message-ID: <20080120033337.GA8277@linux.vnet.ibm.com>
Date:	Sun, 20 Jan 2008 09:03:38 +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 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?

Thanks
-- 
regards,
Dhaval
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