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

[Eric W. Biederman]

> 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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