From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Date: Fri, 14 May 2004 02:09:56 +0000 Subject: Re: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug? Message-Id: <200405131909.56934.jbarnes@engr.sgi.com> List-Id: References: <20040513150842.22F5.YGOTO@us.fujitsu.com> In-Reply-To: <20040513150842.22F5.YGOTO@us.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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