linux-kernel - Re: v2.6.21.4-rt11

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Date:	Mon, 18 Jun 2007 23:36:57 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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 Mon, Jun 18, 2007 at 08:42:15PM +0530, Srivatsa Vaddagiri wrote:
> If you don't have CONFIG_NUMA enabled,
> then we won't have cross-node (i.e cross-cpu) load balancing.

Mmm ..that is not correct. I found that disabling CONFIG_NUMA leads
to better load balance on the problem system (i.e w/o any patches
applied 2.6.22-rc4-mm2 leads to good distribution of rcu readers on all
4 cpus).

Anyway, the patch is still needed for scenarios like you originally
tested with.

-- 
Regards,
vatsa
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