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

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Message-ID: <m1sl9bxl7r.fsf@ebiederm.dsl.xmission.com>
Date:	Fri, 01 Jun 2007 18:18:32 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Emmanuel Fusté <emmanuel.fuste@...oste.net>
Cc:	"djwong" <djwong@...ibm.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Device hang when offlining a CPU due to IRQ misrouting


> As a side note, on my very old SMP machine, 2.6.20 correctly
> load-balance IRQs across CPU but 2.6.21 not. I know that
> in-kernel IRQ load balancer is marked as deprecated and
> somewhat broken, but with your report it make me think it
> could be a bug in the IRQ rerouting part in my case too and
> not necessary in the load-balancer (decision) part.

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.

Eric
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