From cdf32eaa4e601b15146e21b6470de00f149ce37f Mon Sep 17 00:00:00 2001
From: Eric Lammerts <eric@lammerts.org>
Date: Sun, 31 Jul 2005 22:34:42 -0700
Subject: [PATCH] disable addres space randomization default on transmeta CPUs
We know that the randomisation slows down some workloads on Transmeta CPUs
by quite large amounts. We think it's because the CPU needs to recode the
same x86 instructions when they pop up at a different virtual address after
a fork+exec.
So disable randomization by default on those CPUs.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
arch/i386/kernel/cpu/transmeta.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/i386/kernel/cpu/transmeta.c b/arch/i386/kernel/cpu/transmeta.c
index f57e5ee949..d8e59e1986 100644
--- a/arch/i386/kernel/cpu/transmeta.c
+++ b/arch/i386/kernel/cpu/transmeta.c
@@ -76,6 +76,10 @@ static void __init init_transmeta(struct cpuinfo_x86 *c)
#define USER686 (X86_FEATURE_TSC|X86_FEATURE_CX8|X86_FEATURE_CMOV)
if ( c->x86 == 5 && (c->x86_capability[0] & USER686) == USER686 )
c->x86 = 6;
+
+ /* randomize_va_space slows us down enormously;
+ it probably triggers retranslation of x86->native bytecode */
+ randomize_va_space = 0;
}
static void transmeta_identify(struct cpuinfo_x86 * c)
--
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