SMP support for XLR processors.

Rui Paulo rpaulo at
Tue Apr 20 10:05:05 UTC 2010

On 20 Apr 2010, at 10:52, C. Jayachandran wrote:

> On Mon, Apr 19, 2010 at 7:27 PM, C. Jayachandran
> <c.jayachandran at> wrote:
>> I have a possible cause for the panic with invariants - we should not
>> schedule the msgring threads unless the smp is completely up. I guess
>> we start getting message ring interrupts on before the message ring
>> threads can be scheduled.  I am trying out some changes for this -
>> will send you a patch if this fixes it.
> I've attached a patch that should fix the issue. The cause was the way
> message ring threads are started on individual cores and the way
> interrupts are enabled in the core.  I've moved starting message ring
> threads on other cpus to be a SYSINIT after SMP is started.  I'd
> thought originally that it was due to some clash with the changes in
> HEAD - but looks like I was completely off-track there.
> Please let me know if you don't get multi-user with 32 cpus with this
> patch. There is still the original hang in buildworld, but that should
> be a bug elsewhere
> I have a copy at too

This works perfectly, thanks!

Rui Paulo

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