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

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

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?

Jimmy

On Wednesday, January 21, 2009 5:03 PM, Akio Takebe wrote:
> Hi,
> 
> When I tried cpuidle option,
> max_cstate indicates C7 with debug-key in my machine.
> But the result of "xenpm start" doesn't say
> that xen enter C2 or more state.
> Do I need anything else(boot option and so on)?
> 
> 
> (XEN) ==cpu0==
> (XEN) active state:             C1
> (XEN) max_cstate:               C7
> (XEN) states:
> (XEN)    *C1:   type[C1] latency[000] usage[00409594] duration
> [1893990621775]
> (XEN)     C0:   usage[00409594] duration[22279357433]
> (XEN) ==cpu1==
> (XEN) active state:             C1
> (XEN) max_cstate:               C7
> (XEN) states:
> (XEN)    *C1:   type[C1] latency[000] usage[00396768] duration
> [1891756608514]
> (XEN)     C0:   usage[00396768] duration[24513377367]
> 
> # xenpm start
> Elapsed time (ms): 466915
> CPU0:
>         residency       percentage
>   C0    220 ms  0.05%
>   C1    466695 ms       99.95%
>   P0    60 ms   100.00%
>   P1    0 ms    0.00%
> 
> CPU1:
>         residency       percentage
>   C0    606 ms  0.13%
>   C1    466309 ms       99.87%
>   P0    450 ms  100.00%
>   P1    0 ms    0.00%
> 
> 
> Best Regards,
> 
> Akio Takebe
> 
> 
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