linux-kernel - Re: v2.6.21.4-rt11

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Message-ID: <20070619104314.GF17865@linux.vnet.ibm.com>
Date:	Tue, 19 Jun 2007 16:13:14 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	suresh.b.siddha@...el.com, pwil3058@...pond.net.au,
	clameter@....com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: v2.6.21.4-rt11

On Tue, Jun 19, 2007 at 11:04:30AM +0200, Ingo Molnar wrote:
> I'm wondering, why did this trigger under CFS and not on mainline? 

I thought Paul had seen the same problem with 2.6.21.5. I will try a
more recent mainline (2.6.22-rc5 maybe) after I get hold of the problem
machine and report later today.

If there is any difference, it should be because of the reported topology
by low-level platform code. In the problem case, each CPU was being reported
to be a separate node (CONFIG_NUMA enabled) which caused idle_balance()
to stop load-balance lookups at cpu/node level itself. 

> Mainline seems to have a similar problem in idle_balance() too, or am i 
> misreading it?

-- 
Regards,
vatsa
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