[Xen-devel] How to use deeper C state

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

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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