Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757351AbZJFQvJ (ORCPT ); Tue, 6 Oct 2009 12:51:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757277AbZJFQvI (ORCPT ); Tue, 6 Oct 2009 12:51:08 -0400 Received: from bay0-omc3-s24.bay0.hotmail.com ([65.54.246.224]:63806 "EHLO bay0-omc3-s24.bay0.hotmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756977AbZJFQvH (ORCPT ); Tue, 6 Oct 2009 12:51:07 -0400 Message-ID: X-Originating-IP: [164.116.126.146] From: Yuhong Bao To: Linus Torvalds CC: , , , Subject: RE: 2.6.32-rc3: low mem - only 378MB on x86_32 with 64GB. Why? Date: Tue, 6 Oct 2009 09:50:05 -0700 Importance: Normal In-Reply-To: References: X-OriginalArrivalTime: 06 Oct 2009 16:50:06.0215 (UTC) FILETIME=[0E9C4170:01CA46A5] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1416 Lines: 46 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 > On Mon=2C 5 Oct 2009=2C Jeff Chua wrote: >> >> I've 3 systems with 4GB=2C 16GB and 64GB all running 32bit with these se= t: > > Don't. > > 4GB is useable. 8GB is borderline. 16GB+ and nobody will care. > >> # with 64GB >> total used free shared buffers cached >> Mem: 63995 524 63470 0 4 365 >> Low: 378 32 345 > > All your low memory is used for the 'struct page' arrays that describe > everything else. > >> Anything I should do? > > Use a 64-bit CPU and kernel or limit your memory to 8GB or so. No ifs=2C > buts and maybe's. > > Linus Even Windows limits the amount of RAM to 16 GB when both PAE and it's 3G/1G= split mode is enabled for precisely the same reason.(It defaults to 2G/2G = split mode) See this for more info:http://blogs.msdn.com/oldnewthing/archive/2004/08/18= /216492.aspx Yuhong Bao =0A= _________________________________________________________________=0A= Hotmail: Free=2C trusted and rich email service.=0A= http://clk.atdmt.com/GBL/go/171222984/direct/01/= -- 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/