linux-kernel - Re: [PATCH 01/11] x86: Modify Kconfig to allow up to 4096 cpus

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Message-ID: <481605CD.7030807@zytor.com>
Date:	Mon, 28 Apr 2008 10:13:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] x86: Modify Kconfig to allow up to 4096 cpus

Pavel Machek wrote:
>> * Pavel Machek <pavel@....cz> wrote:
>>
>>> On Fri 2008-04-25 17:15:49, Mike Travis wrote:
>>>>   * Increase the limit of NR_CPUS to 4096 and introduce a boolean
>>>>     called "MAXSMP" which when set (e.g. "allyesconfig"), will set
>>>>     NR_CPUS = 4096 and NODES_SHIFT = 9 (512).
>>> Why is redundant option 'maxsmp' a good idea?
>> because this way randconfig can trigger it and can configure all the 
>> otherwise randconfig-invisible [or just plain unlikely] numerics and 
>> options up to their max.
>>
>> I found 2-3 "large box" bugs via that way already.
> 
> Should we improve randconfig to select numeric values when range is
> given, too?
> 								Pavel

Would not be a bad idea; preferrably with a logarithmic distribution.

	-hpa
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