linux-kernel - Re: [patch 01/28] cpu alloc: The allocator

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Message-ID: <Pine.LNX.4.64.0711131401030.4176@schroedinger.engr.sgi.com>
Date:	Tue, 13 Nov 2007 14:02:17 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	linux-mm@...r.kernel.org, linux-kernel@...r.kernel.org,
	schwidefsky@...ibm.com
Subject: Re: [patch 01/28] cpu alloc: The allocator

On Tue, 13 Nov 2007, Eric Dumazet wrote:

> This is because NR_CPUS is defaulted to 32 on i386 (with a limit of 256), so
> reserving 256*256KB = 64 MB of virtual space might be too much. (this is half
> the typical vmalloc area)

It defaults to 8 except if you use a NUMA system.

config NR_CPUS
        int "Maximum number of CPUs (2-255)"
        range 2 255
        depends on SMP
        default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
        default "8"

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