linux-kernel - Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86

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Date:	Fri, 21 Mar 2008 15:57:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>
Cc:	ak@...e.de, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86_64


* Jack Steiner <steiner@....com> wrote:

> On Fri, Mar 21, 2008 at 03:26:49PM +0100, Ingo Molnar wrote:
> > 
> > * Jack Steiner <steiner@....com> wrote:
> > 
> > > Allow the maximum number of nodes in an x86_64 system to be 
> > > configurable. This patch does NOT change the default value but allows 
> > > the value to be a config option.
> > 
> > i've applied your patch - but i'm wondering, shouldnt we auto-scale the 
> > default according to max number of CPUs? (with some sensible scaling 
> > that happens to meet your expected large-system needs as well ;-) All 
> > the current manual configuration of nodes shift is ugly.
> 
> I would prefer to auto-scale, too, but our hardware platform allows 
> too many options to make it easy. The current system configs will 
> support from 0 to 32 cpus per node (some nodes have memory only).
> 
> However, I'm open to suggestions if you have any ideas....

how about scaling for the worst case, and allowing distros to tune down 
if they really want? What's the cost of a too large NODE_SHIFT?

	Ingo
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