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

["Wei, Gang" <gang.wei@xxxxxxxxx>]

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. 

Jimmy
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