Re: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug?

Jesse Barnes
2004-05-14T02:09:56Z

On Thursday, May 13, 2004 6:28 pm, Dave Hansen wrote:
> I don't see any real reasons why we can't make I/O only nodes. I know
> that we've run into and fixed a few situations where a node came up with
> either no cpus or no memory for various reasons before. Does anybody
> have any philosophical objections to having I/O only nodes?

Well, it's kind of odd conceptually (to me a node implies memory) but SGI has
such nodes. They're simply numalink<->pci bridges, and as such are
individually addressable and have physical NUMA node ids.

> In any case, I'd bet we'll need some form of this eventually. On my
> hardware, It's probably possible to hotplug individual CPUs or sections
> of memory in such a way that a node has no online cpus or memory. So,
> we'll probably have to handle those cases anyway.

Yep, I suppose so.

Jesse