Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86_64

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From: Ingo Molnar <mingo@...>

To: Jack Steiner <steiner@...>

Cc: <ak@...>, <tglx@...>, <linux-kernel@...>

Subject: Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86_64

Date: Friday, March 21, 2008 - 10:57 am

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

quoted text> On Fri, Mar 21, 2008 at 03:26:49PM +0100, Ingo Molnar wrote:
> > 
> > * Jack Steiner <steiner@sgi.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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Messages in current thread:

[PATCH] - Allow NODES_SHIFT to be a config option on x86_64, Jack Steiner, (Fri Mar 21, 9:34 am)

Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86..., Ingo Molnar, (Fri Mar 21, 10:26 am)

Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86..., Jack Steiner, (Fri Mar 21, 10:54 am)

Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86..., Ingo Molnar, (Fri Mar 21, 10:57 am)

Re: [PATCH] - Allow NODES_SHIFT to be a config option on x86..., Jack Steiner, (Fri Mar 21, 11:23 am)

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