Messages in this thread | | | Date | Wed, 6 Jul 2005 16:53:15 -0400 | From | Dave Jones <> | Subject | Re: Slowdown with randomize_va_space in 2.6.12.2 |
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On Wed, Jul 06, 2005 at 12:57:19PM -0700, David S. Miller wrote: > From: Paulo Marques <pmarques@grupopie.com> > 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.
On Transmeta CPUs that probably triggers a retranslation of x86->native bytecode, if it thinks it hasn't seen code at that address before.
Dave
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