Messages in this thread | | | Date | Fri, 1 Jun 2007 23:57:41 +0200 | Subject | Re: Device hang when offlining a CPU due to IRQ misrouting | From | Emmanuel Fusté <> |
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> There exists a similar scenario. Set the IRQ affinity to a bunch of > CPUs, watch /proc/interrupts to see which CPU is actually servicing the > interrupts, then offline that CPU. The kernel does not reroute the IRQ > to any of the other CPUs and the device also hangs. > > The furthest that I've dug is that it works on 2.6.17 and is broken in > 2.6.22-rc3 and 2.6.21. Will git-bisect further, but I wanted to know if > anyone else has seen this sort of problem. afaik, this seems to happen > with both IOAPIC and MSI interrupts, possibly more. Hi, 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.
Emmanuel.
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