From: Andi Kleen Date: Tue, 26 Sep 2006 08:52:41 +0000 (+0200) Subject: [PATCH] Use string instructions for Core2 copy/clear X-Git-Tag: v2.6.19-rc1~1077^2~17 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27fbe5b28a2ffef171c6005f304ea4f80fcdcc01;p=linux-2.6 [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 --- diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index e328e3eb8c..085f2e09b9 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);