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

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Message-ID: <48777D15.6040107@linux-foundation.org>
Date:	Fri, 11 Jul 2008 10:32:37 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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

H. Peter Anvin wrote:
> Christoph Lameter wrote:
>> H. Peter Anvin wrote:
>>
>>> And how much is that, especially on *small* systems?
>>
>> i386?
>>
>> i386 uses 4K mappings. There are just a few cpus supported, there is
>> scarcity of ZONE_NORMAL memory so the per cpu areas really cannot get
>> that big. See the cpu_alloc patchsets for i386.
>>
> 
> No, not i386.  x86-64.

x86_64 are small systems? For 64 bit use one would expect 4GB of memory.
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