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SubjectRe: [patch] Mark rdtsc as sync only for netburst, not for core2
Zhang, Yanmin wrote:
> If it's a single processor, the go backwards issue doesn't exist. Below is
> my patch based on Arjan's. It's against 2.6.19-rc5-mm2.
Hi,

this patch is incorrect
> --- linux-2.6.19-rc5-mm2_arjan/arch/x86_64/kernel/setup.c 2006-11-29 10:41:21.000000000 +0800
> +++ linux-2.6.19-rc5-mm2_arjan_fix/arch/x86_64/kernel/setup.c 2006-11-29 10:42:28.000000000 +0800
> @@ -861,7 +861,7 @@ static void __cpuinit init_intel(struct
> set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
> if (c->x86 == 6)
> set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
> - if (c->x86 == 15)
> + if (c->x86 == 15 && num_possible_cpus() != 1)
> set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);

first of all, you probably meant "|| num_possible_cpus() == 1"

but second of all, the core2 cpus are dual core so.. .what does it
bring you at all?
-
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