linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Message-ID: <4876A5CA.7020109@zytor.com>
Date:	Thu, 10 Jul 2008 20:14:02 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Mike Travis wrote:
> 
> Hmm, that might be the way to go.... At boot up time determine the
> size of the system in terms of cpu count and memory available and
> attempt to do the right thing, with startup options to override the
> internal choices... ?
> 
> (Surely a system that has a "gazillion ip tunnels" could modify it's
> kernel start options... ;-)
> 
> Unfortunately, we can't use a MODULE to support different options unless
> we change how the kernel starts up (would need to mount the root fs
> before starting secondary cpus.)
> 

Using a module doesn't make any sense anyway.  This is more what the 
kernel command line is for.

	-hpa
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