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AW: RE: RE: RE: [Xen-devel] No C-States any longer...

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: AW: RE: RE: RE: [Xen-devel] No C-States any longer...
From: Carsten Schiers <carsten@xxxxxxxxxx>
Date: Thu, 16 Jun 2011 08:47:53 +0200
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Maybe a dump question, but in the beginning of our discussion, we had:

>> In drivers/scpi/processor_idle.c:
>> On a working Intel machine, it will go through it like this:
>>   - acpi_processor_get_power_info_cst, which returns 0
>>   - acpi_processor_get_power_info_default
>>   - later acpi_processor_power_verify will find some c-states
>this is expected sequence
>> On my non-working AMD machine, it will go through like this:
>>   - acpi_processor_get_power_info_cst, which returns -ENODEV
>>   - acpi_processor_get_power_info_fadt, which also return -ENODEV
>>   - this result is returned

There is a comment in acpi_processor_get_power_info_default it is
said that all processors need to support C1 at least. So (hypothesis), 
if my BIOS is not implemented as specified (neither _CST nor PBLK), 
shouldn't acpi_processor_get_power_info_default also bee called on my 
machine? Is the code exiting too early?


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