Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756729AbYGKPdy (ORCPT ); Fri, 11 Jul 2008 11:33:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753667AbYGKPdq (ORCPT ); Fri, 11 Jul 2008 11:33:46 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:35730 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753277AbYGKPdp (ORCPT ); Fri, 11 Jul 2008 11:33:45 -0400 Message-ID: <48777D15.6040107@linux-foundation.org> Date: Fri, 11 Jul 2008 10:32:37 -0500 From: Christoph Lameter User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Mike Travis , Jeremy Fitzhardinge , "Eric W. Biederman" , Arjan van de Ven , Ingo Molnar , Andrew Morton , Jack Steiner , linux-kernel@vger.kernel.org, Rusty Russell Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <20080709200757.GD14009@elte.hu> <48751B57.8030605@goop.org> <20080709133958.612635f0@infradead.org> <4875231F.1020506@zytor.com> <487524A0.6020304@goop.org> <487529AE.3060505@zytor.com> <48753A71.2030006@zytor.com> <48763732.7020805@sgi.com> <487641D6.5060206@goop.org> <487649B2.3000405@sgi.com> <48764E8A.5010400@zytor.com> <4876766F.4030605@linux-foundation.org> <48767804.8080007@zytor.com> <48767A28.7070900@linux-foundation.org> <48767AF5.7030205@zytor.com> In-Reply-To: <48767AF5.7030205@zytor.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 695 Lines: 21 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/