diff options
Diffstat (limited to 'arch/i386/kernel/cpu/amd.c')
| -rw-r--r-- | arch/i386/kernel/cpu/amd.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c index 091b98ae93b6..ae94585d0445 100644 --- a/arch/i386/kernel/cpu/amd.c +++ b/arch/i386/kernel/cpu/amd.c @@ -188,6 +188,23 @@ static void __init init_amd(struct cpuinfo_x86 *c) } display_cacheinfo(c); + detect_ht(c); + +#ifdef CONFIG_X86_HT + /* AMD dual core looks like HT but isn't really. Hide it from the + scheduler. This works around problems with the domain scheduler. + Also probably gives slightly better scheduling and disables + SMT nice which is harmful on dual core. + TBD tune the domain scheduler for dual core. */ + if (cpu_has(c, X86_FEATURE_CMP_LEGACY)) + smp_num_siblings = 1; +#endif + + if (cpuid_eax(0x80000000) >= 0x80000008) { + c->x86_num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1; + if (c->x86_num_cores & (c->x86_num_cores - 1)) + c->x86_num_cores = 1; + } } static unsigned int amd_size_cache(struct cpuinfo_x86 * c, unsigned int size) |