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

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Message-ID: <4877852A.7070203@zytor.com>
Date:	Fri, 11 Jul 2008 12:07:06 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Mike Travis <travis@....com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Christoph Lameter wrote:
>>>
>> No, not i386.  x86-64.
> 
> x86_64 are small systems? For 64 bit use one would expect 4GB of memory.

Hardly so.  i386 has too many other limitations; for one thing, it 
starts having performance problems (needing HIHGMEM) at less than 1 GB. 
  The additional registers, etc.

	-hpa
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