Messages in this thread Patch in this message | | | Subject | [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs | From | john stultz <> | Date | Mon, 19 Sep 2005 12:16:43 -0700 |
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Andrew, This patch should resolve the issue seen in bugme bug #5105, where it is assumed that dualcore x86_64 systems have synced TSCs. This is not the case, and alternate timesources should be used instead.
For more details, see: http://bugzilla.kernel.org/show_bug.cgi?id=5105
Please consider for inclusion in your tree.
thanks -john
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c --- a/arch/x86_64/kernel/time.c +++ b/arch/x86_64/kernel/time.c @@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi are handled in the OEM check above. */ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) return 0; - /* All in a single socket - should be synchronized */ - if (cpus_weight(cpu_core_map[0]) == num_online_cpus()) - return 0; #endif /* Assume multi socket systems are not synchronized */ return num_online_cpus() > 1;
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