From 27fbe5b28a2ffef171c6005f304ea4f80fcdcc01 Mon Sep 17 00:00:00 2001 From: Andi Kleen <ak@suse.de> Date: Tue, 26 Sep 2006 10:52:41 +0200 Subject: [PATCH] [PATCH] Use string instructions for Core2 copy/clear It is faster than using a unrolled loop for the use cases the kernel cares about (cached, sizes typically < 4K) Signed-off-by: Andi Kleen <ak@suse.de> --- arch/x86_64/kernel/setup.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index e328e3eb8cbe..085f2e09b9dc 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -843,6 +843,8 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) if ((c->x86 == 0xf && c->x86_model >= 0x03) || (c->x86 == 0x6 && c->x86_model >= 0x0e)) set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability); + if (c->x86 == 6) + set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability); set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability); c->x86_max_cores = intel_num_cpu_cores(c); -- GitLab