linux-kernel - Re: [PATCH 0/2] NR_CPUS: increase maximum NR

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Message-ID: <47EA72E9.4060307@sgi.com>
Date:	Wed, 26 Mar 2008 08:59:37 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] NR_CPUS: increase maximum NR_CPUS to 4096

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>> Increases the limit of NR_CPUS to 4096 and introduces a boolean called 
>> "MAXSMP" which when set (e.g. "allyesconfig") will set NR_CPUS = 4096 
>> and NODES_SHIFT = 9 (512).
>>
>> I've been running this config (4k NR_CPUS, 512 Max Nodes) on an AMD 
>> box with 2 dual-cores and 4gb memory.  I've also successfully booted 
>> it in a simulated 2cpus/1Gb environment.
> 
> cool!
> 
> this depends on the cpumask changes to work correctly (i.e. to boot at 
> all), right?
> 
> 	Ingo


Yes, it overflows the stack quite quickly without the cpumask changes.
I didn't do any testing to see what's the minimal set of changes.

Thanks,
Mike
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