Re: Slowdown with randomize_va_space in 2.6.12.2

[Arjan van de Ven]

On Wed, 2005-07-06 at 12:57 -0700, David S. Miller wrote:
> From: Paulo Marques <pmarques@xxxxxxxxxxxx>
> Date: Wed, 06 Jul 2005 15:23:56 +0100
> 
> > What is weird is that most of the extra time is being accounted as 
> > user-space time, but the user-space application is exactly the same in 
> > both runs, only the "randomize_va_space" parameter changed.
> 
> It might be attributable to more cpu cache misses in userspace since
> the virtual addresses of everything are changing each and every
> invocation.

also x86 technically is pipt so virtual addresses shouldn't matter...



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