linux-kernel - Re: pud_bad vs pud

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Message-ID: <498B7F7F.3090701@goop.org>
Date:	Thu, 05 Feb 2009 16:08:31 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Hugh Dickins <hugh@...itas.com>,
	William Lee Irwin III <wli@...ementarian.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: pud_bad vs pud_bad

Ingo Molnar wrote:
> just the act of using PAE was measured to cause multi-percent slowdown in 
> fork() and exec() latencies, etc. The pagetables are twice as large so is 
> that really surprising?
>   

Is there a similar slowdown running the CPU in 32 vs 64 bit mode?  Or 
does having more/wider registers mitigate it?

    J
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