linux-kernel - Re: Regression in gdm-2.18 since 2.6.24

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Date:	Wed, 9 Apr 2008 14:07:57 +0100
From:	Ken Moffat <zarniwhoop@...world.com>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	lkml <linux-kernel@...r.kernel.org>, a.p.zijlstra@...llo.nl,
	aneesh.kumar@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com,
	Balbir Singh <balbir@...ibm.com>, skumar@...ux.vnet.ibm.com
Subject: Re: Regression in gdm-2.18 since 2.6.24

On Tue, Apr 08, 2008 at 02:20:27PM +0530, Srivatsa Vaddagiri wrote:
> On Mon, Apr 07, 2008 at 12:48:33AM +0100, Ken Moffat wrote:
> >  Well, I found your analysis convincing.  Unfortunately, my hardware
> > disagreed.  Testing -rc8 with CONFIG_GROUP_SCHED disabled (a test is
> > a mixture of 5 attempts to restart and 5 to shutdown):
> > 
> > 1. the base version success is 4/10
> > 
> > 2. increasing the granularity by a factor of 10 as you requested,
> > success is 8/10
> 
> This makes me think that we are just exposing a timing related problem
> in gdm here.
> 
> How abt a larger factor?
> 
> 	# echo 200000000 > /proc/sys/kernel/sched_wakeup_granularity_ns
> 
> Does that make it 10/10 ?!
> 
[ snipping the suggestion to run strace, I've already sent the
results off-list ]

 Yes, it does.  Seems to run adequately too (a little audio playback,
a little you-tube, some untarring and compiling).  Understanding the
real problem would be nice, but for me this seems to be an adequate
work-around.  This is with CONFIG_GROUP_SCHED turned off.

Thanks

Ken
-- 
das eine Mal als Tragödie, das andere Mal als Farce
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