RE: [PATCH] CPU hotplug returns CPUs to SAL

From: Luck, Tony <tony.luck_at_intel.com>
Date: 2005-02-10 06:51:20
>   But the BSP doesn't need to save anything.  We'll always have N-1 SAL
>states saved and N-1 CPUs that can be taken offline.  As long as we
>don't hard link a state to a specific CPU, we're in good shape.  I've
>been testing on my boxes with an order that intentionally gives CPUs the
>state saved off of another CPU on OS entry.  I appear to be able to make
>the BSP return to SAL as well, but I don't think the rest of the hotplug
>code is ready for this (the other CPU doesn't seem to be getting
>scheduled).

That sounds worrying ... it assumes that the SAL thinks that
cpus are fungible, which might not be true on ccNUMA systems.

-Tony
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Received on Wed Feb 9 14:51:41 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:35 EST