linux-kernel - Re: PAE/NX without performance drain?

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Message-Id: <1165743478.27217.187.camel@laptopd505.fenrus.org>
Date:	Sun, 10 Dec 2006 10:37:57 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	John Richard Moser <nigelenki@...cast.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PAE/NX without performance drain?

On Sat, 2006-12-09 at 15:39 -0500, John Richard Moser wrote:
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> Apparently (as I've been told today) using a hardware NX bit in a 32-bit
> x86 kernel requires PAE mode.  PAE mode is enabled with HIGHMEM64, which
> is (apparently) extremely slow.

it's not extremely slow. 

there is a minor performance delta, sure, but to be honest that's a
benchmark thing more than a real life thing.

What did your measurements show that the slowdown was? And how did you
measure this?

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