Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: 2.6.19-rc1 genirq causes either boot hang or "do_IRQ: cannot handle IRQ -1" | Date | Sat, 07 Oct 2006 10:52:24 -0600 |
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Muli Ben-Yehuda <muli@il.ibm.com> writes:
> On Fri, Oct 06, 2006 at 05:42:40PM -0600, Eric W. Biederman wrote: > >> If I read your bootlog right. You have logical cpus, but only two >> sockets, and I think only two cores. The other two logical cpus >> being hyperthreaded. > > Yes, 2 sockets each of which is HT. Here's a /proc/cpuinfo from a > distro kernel:
Ok. From looking at an individual case the ioapic is programmed correctly and I don't see a reason the local apic would be programmed incorrectly. However logical delivery mode and lowest priority delivery mode are enabled. So we are asking the interrupt delivery subsystem to choose a cpu to deliver the interrupt to and then are not giving the cpu any choice. So we may be confusing things.
Can you try CONFIG_CPU_HOTPLUG? That will force genapic to be set to genapic_physflat instead of genapic_flat.
I am hoping that by running the apics in a different delivery mode that explicitly says just deliver this interrupt to this cpu we will avoid the problem you are seeing.
If genapic_physflat works we will have to decide what to do about genapic_flat.
Thanks,
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