Message-ID: <457C747A.6010702@comcast.net>
Date: Sun, 10 Dec 2006 15:56:26 -0500
From: John Richard Moser <nigelenki@comcast.net>
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To: Arjan van de Ven <arjan@infradead.org>
CC: linux-kernel@vger.kernel.org
Subject: Re: PAE/NX without performance drain?
References: <457B1F02.7030409@comcast.net>	 <1165743478.27217.187.camel@laptopd505.fenrus.org>	 <457C28F8.4050409@comcast.net> <1165779603.27217.231.camel@laptopd505.fenrus.org>
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Arjan van de Ven wrote:
>> Too bad PAE can't be detected at boot time; someone else mentioned that
>> some recent Pentium M laptops (and anything older than PPro) don't boot
>> if PAE is on.
> 
> even Windows has 2 kernel binaries for this case btw, it's really really
> really hard.
> 

Yeah, I've been told Windows has 4 kernels (SMP/UP x PAE/NonPAE).  In
the case of a microkernel it'd be trivial; in the case of a monolith,
you'd basically be shoehorning uK behavior in, probably by compiling
both sets of functions and linking the appropriate set just-in-time
(i.e. before entering protected mode).  This would be an ugly hack.

>> I want my hardware NX bit working in Ubuntu without having to recompile
>> my kernel dammit.
> 
> other distros ship a PAE enabled kernel, and use that for NX enabled
> machines (all NX capable machines support PAE obviously). I'm surprised
> Ubuntu doesn't, maybe ask them? (Or use a distro that does have this)
> 

OpenSuSE and Fedora Core 6 both fail this; I checked the .config for the
default kernels (by proxy on OpenSuSE 10.2; I asked someone) and ran my
test case on FC6 (LiveCD from
http://www.fedoraunity.org/news-archives/fedora-core-6-zod-live-spins-released).


- --
    We will enslave their women, eat their children and rape their
    cattle!
                  -- Bosc, Evil alien overlord from the fifth dimension
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