Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory

Jack Steiner
2006-11-16T03:28:44Z

On Wed, Nov 15, 2006 at 05:57:27PM -0800, Christoph Lameter wrote:
> On Wed, 15 Nov 2006, Jack Steiner wrote:
>
> > I doubt that there is a demand for systems with memoryless nodes. However, if the
> > DIMM(s) on a node fails, I think the system may perform better
> > with the cpus on the node enabled than it will if they have to be
> > disabled.
>
> Right now we do not have the capability to remove memory from a node while
> the system is running.

I know. I'm refering to a DIMM that fails power-on diags or one
that is explicitly disabled from the system controller.

Clearly a reboot is required in both cases, but the end result is
a node with cpus and no memory. As I said earlier, the PROM (for several
reasons) automatically the cpus on nodes w/o memory.