Re: [patch 2/2] x86_64: Configure stack size

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 9 Nov 2007 12:45:06 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> On Fri, 9 Nov 2007, Andrew Morton wrote:
> 
> > otoh, I doubt if anyone will actually ship an NR_CPUS=16384 kernel, so it
> > isn't terribly pointful.
> 
> Our competition (Cray) just announced a product featuring up to 21k 
> cpus although that is a cluster. We are definitely getting there...

I'm talking about software, not hardware.  I'd expect that you'll have
trouble talking RH/suse/etc into general shipping of an NR_CPUS=16384
kernel.

If I'm correct than I'd have thought that this will be a significant
problem for SGI, so we should find other solutions.

> > So I'm wobbly.  Could we please examine the alternatives before proceeding?
> 
> This works fine with a 32k stack on IA64 with 4k processors.

yeah, but that's an order-1 allocation on ia64, not an order-3.

> So I tend to 
> think of this as a solution that is already working on another platform. 
> An 8k stack is also going to be tough with 4k processors on x86_64 which 
> we will have soon.
> 

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