From: Dave Jones <davej@redhat.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: pmarques@grupopie.com, linux-kernel@vger.kernel.org
Subject: Re: Slowdown with randomize_va_space in 2.6.12.2
Date: Wed, 6 Jul 2005 16:53:15 -0400 [thread overview]
Message-ID: <20050706205315.GC27630@redhat.com> (raw)
In-Reply-To: <20050706.125719.08321870.davem@davemloft.net>
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
next prev parent reply other threads:[~2005-07-06 21:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-06 14:23 Slowdown with randomize_va_space in 2.6.12.2 Paulo Marques
2005-07-06 19:57 ` David S. Miller
2005-07-06 20:53 ` Dave Jones [this message]
2005-07-06 20:58 ` David S. Miller
2005-07-07 1:12 ` Andrew Morton
2005-07-07 2:07 ` David S. Miller
2005-07-07 4:11 ` pmarques
2005-07-07 6:37 ` Arjan van de Ven
2005-07-07 6:41 ` Andrew Morton
2005-07-07 6:46 ` Arjan van de Ven
2005-07-30 0:53 ` Eric Lammerts
2005-07-30 1:20 ` Andrew Morton
2005-07-30 11:49 ` Arjan van de Ven
2005-07-30 11:55 ` Arjan van de Ven
2005-07-06 21:00 ` Arjan van de Ven
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