linux-kernel - Re: Device hang when offlining a CPU due to IRQ misrouting

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Message-ID: <20070602021906.GC13751@tree.beaverton.ibm.com>
Date:	Fri, 1 Jun 2007 19:19:07 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Emmanuel Fust? <emmanuel.fuste@...oste.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Device hang when offlining a CPU due to IRQ misrouting

On Fri, Jun 01, 2007 at 06:18:32PM -0600, Eric W. Biederman wrote:

> I doubt it.  The practical problem is that cpu_down does not
> and by design can not call the irq balancing part properly
> and I haven't yet seen anything to suggest that we don't migrate
> irq properly.
> 
> So I'm guessing it was the decision part.

I'm not using any IRQ balancer, afaik.  As I recall, CONFIG_IRQBALANCE
is i386-only, and I'm not running the userland irqbalance program
either.  Just messing around with /proc/irq/*/smp_affinity by hand. :)

--D
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