Hi Venki, I have a dual-Woodcrest machine here with _PSD tables that specify that cpufreq coordination between cores is done in hardware with DOMAIN_COORD_TYPE_HW_ALL. On this particular machine, CPU 0 and CPU 2 are on the same package, and it looks like they have to be at the same frequency.
However, it seems that acpi_cpufreq_cpu_init() only sets policy->cpus to the shared cpu mask if software coordination is required. While this does have the effect of letting the hardware do its coordination job as advertised, it also means that a frequency change to CPU0 doesn't get echoed to CPU2 as it should be, and affected_cpus is inaccurate. This seems like a bug to me. I can whip up a patch to set the policy cpu mask in all cases and neuter all but one of the MSR/PCT writes if HW coordination is desired so that HW coordination is preserved and sysfs is accurate, but I'm curious to know if I've gotten it right. --D - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
