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

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Message-ID: <20061116032835.GA25299@sgi.com>
Date:	Wed, 15 Nov 2006 21:28:35 -0600
From:	Jack Steiner <steiner@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	Christian Krafft <krafft@...ibm.com>, linux-mm@...ck.org,
	Martin Bligh <mbligh@...igh.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory

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.

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