Hot Swapping CPUs?
Tom
tom at sdf.com
Fri Jan 2 09:59:14 PST 2004
On Fri, 2 Jan 2004, Oliver Brandmueller wrote:
> Hi all,
>
> With late ULE you can watch a process hopping between CPUs. This seems
You can see that with the 4BSD scheduler too. It has always been a
"feature" on the scheduler. I can see this on FreeBSD 3.5 too.
> to the base functionality for CPU hot swapping. One would need (apart
> from a Motherboard that's able to that ;-)) some control over CPUs now,
> like disabling a physical CPU during runtime (which could also be done
> automatically on certain filure onditions).
sysctl already exposes some variabled to control CPUs on an SMP system.
It is a pretty hard to detect a CPU failure in software, because the
software detection will fail at the same time the CPU does.
> Is there any work in progress in this direction? Would be a very neat
> feature for high availability systems.
>
> - Oliver
Tom
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