linux-kernel - RE: Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks

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Date:	Fri, 15 Jan 2010 18:06:13 -0800
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<hpa@...or.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>, <mingo@...hat.com>,
	<linux-kernel@...r.kernel.org>
Subject: RE: Ubuntu 32-bit, 32-bit PAE, 64-bit Kernel Benchmarks


> The big difference isn't between HIGHMEM4G (no PAE) and HIGHMEM64G
> (PAE), it's between HIGHMEM and !HIGHMEM. That cutoff is ~892 MB for a
> stock 32-bit kernel.
Unfortunately most desktop/laptop systems nowadays ship with more than 1GB.Luckily, in the case of Atom netbooks that Linus mentioned, most Atom netbooks ship with only 1GB of RAM, partly due to MS's restrictions.However, disabling HIGHMEM will turn off NX which all Atom CPUs have, unless you turn CONFIG_PAE back on.
Yuhong Bao 		 	   		  
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