The idea was to run all three counters, which means we need to program 7 into the enable mask, not 3 (which is two bits). Signed-off-by: Peter Zijlstra --- Index: linux-2.6/arch/x86/kernel/cpu/perf_event_intel.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/cpu/perf_event_intel.c +++ linux-2.6/arch/x86/kernel/cpu/perf_event_intel.c @@ -504,7 +504,7 @@ static void intel_pmu_nhm_enable_all(int wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + 1, 0x4300B1); wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + 2, 0x4300B5); - wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x3); + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x7); wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x0); for (i = 0; i < 3; i++) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/