Re: [XenPPC] [PATCH] Handshake with secondary processors (take 2)

[Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>]

> > If it takes more than the proposed 5 secs, why bother -- your
> > system is dead anyway ;-)
> Hmm.. ok.. I am being parnoid,  I just don't trust the FW guys to  
> leave a processor off line that may suck :)
> How SLOF make sure the processor is good? does it?
Only the service processor can completely shut down a CPU, on
our blades anyway.  So the best that SLOF can do is hope for
the best.  The secondary-CPU startup code has been engineered
to be pretty much 100% failure proof though.  And a dead CPU
won't be shown in the device tree.

> I guess I'm looking for a way to decide that things are bad.
There's one way we are bad right now: we require all secondary
cpu's to be started, they are not idle but running in a spinloop
somewhere.  Cache invalidate those addresses and hell breaks
loose ;-)

Not a real problem in practice, which is why I still didn't fix it.


Segher


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