RE: [Xen-devel] How to use deeper C state

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Hi,

>On Wednesday, January 21, 2009 5:35 PM, Akio Takebe wrote:
>> Hi,
>> 
>>> The max_cstate just means if there are c-state deep to C7, those deep C
>>> states can be entered. But from below debug out, I found the deepest C 
>>> state
>>> supported is C1 in you machine because all supported C states will be
>>> printed out. 
>>> 
>>> You machine may not support deep C states, or dom0 failed to detected it 
>>> from
>>> BIOS. Can you provide the whole 'xm dmesg' result right after booting up?
>>> 
>> Thank you for your reply.
>> The xm dmesg is below.
>>...
>> 
>> (XEN) cpu1 cx acpi info:
>> (XEN)   count = 1
>> (XEN)   flags: bm_cntl[0], bm_chk[0], has_cst[0],
>> (XEN)          pwr_setup_done[1], bm_rld_set[0]
>> (XEN)   states[0]:
>> (XEN)           reg.space_id = 0x0
>> (XEN)           reg.bit_width = 0x0
>> (XEN)           reg.bit_offset = 0x0
>> (XEN)           reg.access_size = 0x0
>> (XEN)           reg.address = 0x0
>> (XEN)           type    = 1
>> (XEN)           latency = 0
>> (XEN)           power   = 0
>> (XEN)           dp(@0x0000000000000000)
>
>Yes, dom0 only detected and passed one C state to HV. Can you give the 
>machine model? Meanwhile please have some checks on CMOS options for whether 
>there are some C-state or ACPI related options which are not enabled. 
>
Thank you very much. I'll check some BIOS menu.

Best Regards,

Akio Takebe


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