linux-kernel - Re: NMI watchdog triggering during load

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Date:	Fri, 06 Mar 2015 20:29:15 +0100
From:	Mike Galbraith <efault@....de>
To:	David Ahern <david.ahern@...cle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: NMI watchdog triggering during load_balance

On Fri, 2015-03-06 at 11:37 -0700, David Ahern wrote:

> But, I do not understand how the wrong topology is causing the NMI 
> watchdog to trigger. In the end there are still N domains, M groups per 
> domain and P cpus per group. Doesn't the balancing walk over all of them 
> irrespective of physical topology?

You have this size extra large CPU domain that you shouldn't have,
massive collisions therein ensue.

	-Mike

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