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[Xen-devel] How to use deeper C state
| To: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] How to use deeper C state |
| From: | Akio Takebe <takebe_akio@xxxxxxxxxxxxxx> |
| Date: | Wed, 21 Jan 2009 18:02:59 +0900 |
| Cc: | "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx> |
| Delivery-date: | Wed, 21 Jan 2009 01:03:34 -0800 |
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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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