Hi
thanks you all.
finally,I known form ACPI Specification ,and get what does these words:
Pstate,Cstate,Gstate,State and Tstate mean.
as wang says,"It is kernel who put into some Cx state safely." I checked the
file "drivers/acpi/processor_idle.c" in kernel,and find
"acpi_processor_power_verify_cx" change the CPU cstate in final.
So any other driver who can can the funtion "acpi_processor_power_verify_cx"
is not safe,the kernel will be wakeup by interrupt.
I checked the CPU cstate and pstate by the tool Power-top,and find the cpu
is always in C4(Deeper sleep)/P2(600MHz) when user have no opertions.so we can
get the cpu Actual power loss.
By the way,can anybody known how to test the notebook Power Loss,and what
mothed and tools.
thanks.
Yours:Lori
在2009-09-16?22:02:21，"Wang,?Jing?J"?<[email protected]>?写道：
>It?is?not?Moblin,?but?standard?linux?kernel?which?doesn't?provide?user?interface?to?force?CPU?into?Cx?state?other?than?C0.?From?my?point?of?view,?this?interface?is?totally?meaningless?because?Cx>C0?means?CPU?stop?working.?Even?you?can?force?CPU?into?some?C?state,?external?interrupt?will?wakeup?the?CPU?immediately,?or?system?will?fall?into?a?mess.?It?is?kernel?who?well?knows?when?CPU?can?be?put?into?some?Cx?state?safely?and?how?long?it?will?stay?based?on?complex?calculation.?For?user,?it?is?impossible?to?know?it.
>If?you'd?like?measure?power?consumption?when?system?is?in?idle,?just?let?it?go.?Even?put?system?into?S3?state?is?a?bit?more?make?sense.
>
>-----Original?Message-----
>From:[email protected]?[mailto:[email protected]]?on?behalf?of?smart?yang
>Sent:?2009年9月16日?14:55
>To:?Zhang,?Austin;[email protected];[email protected]
>Subject:?Re:?[Moblin?Dev]?low?power?state?of?atom
>
>Hi?Austin,
>
>?
>
>We?can?make?or?modify?some?driver?to?"setting"?CPU?into?some?state.?And?the
>whole?process?need?no?intervention?from?user?mode.
>
>?
>
>We?want?to?know?whether?moblin?has?some?low?level?interface?or?driver?which
>can?make?CPU?enter?some?power?state.?And?we?can?invoke?them?to?set?CPU?state
>which?is?most?like?deciding?by?OS?as?you?mentioned.
>
>?
>
>?
>
>?
>
>Message:?9
>
>Date:?Wed,?16?Sep?2009?14:41:59?+0800
>
>From:?"Zhang,?Austin"?<[email protected]>
>
>To:?????<[email protected]>,?Arjan?van?de?Ven
><[email protected]>
>
>Cc:?dev?<[email protected]>
>
>Subject:?Re:?[Moblin?Dev]?low?power?state?of?atom
>
>Message-ID:
>
>?
><38d9f46dff92c54980d2f2c1e8ee313001ab921...@pdsmsx503.ccr.corp.intel.com>
>
>?????????
>
>Content-Type:?text/plain;?charset="gb2312"
>
>?
>
>>?how?can?we?get?this?tool.so?we?can?exactly?know?which?C?and?P?states?the
>system?using.
>
>>???then,
>
>>???????how?can?we?set?the?CPU??into?Deeper?sleep?like?pxa270?we?can?change
>cpu?mode?by?writting?cp15?register
>
>>?
>
>>???we?check?the?datasheet?of?both?z5xx?and?SCH(us15wx)?,but?find?no
>description?of?how?can?we?generate?the?signals?which?can?force?CPU?enter
>Deeper?sleep.
>
>Why?not?google?:)?
>
>http://www.lesswatts.org/projects/powertop/?
>
>?
>
>Again,?like?arjan?said,?when?you?are?trying?to?'setting'?it,?that?means?your
>cpu?is?working,?so?at?this?kind?of?situation,?you?CAN?NOT?enter?into?deep?c
>because?cpu?is?working?to?your?task.
>
>Please?let?OS/CPU?decide?when?and?which?level?it?should?go?to?rather?than
>'setting'?it.?
>
>?
>
>>?my?purpose?is?to?check?the?cpu?Actual?power?loss?when?cpu?work?in?Deeper
>sleep(C4)?or?Deep?power?down(C6)?.
>
>Maybe?you?should?use?some?physical?device?like?power?meter?rather?than?by
>'setting?something?and?check?it'?for?this?purpose.?
>
>?
>
>-----Original?Message-----
>
>From:[email protected]?[mailto:[email protected]]?on?behalf?of
>???
>
>Sent:?Wednesday,?September?16,?2009?2:20?PM
>
>To:?Arjan?van?de?Ven
>
>Cc:?dev
>
>Subject:?Re:?[Moblin?Dev]?low?power?state?of?atom
>
>?
>
>Hi?
>
>???thanks?for?your?answer?
>
>???first?
>
>????????I?suspect?that?your?system?WILL?go?into?C4.
>
>???????If?you?are?not?sure,?you?can?run?the?powertop?tool,?how?can?we?get
>this?tool.so?we?can?exactly?know?which?C?and?P?states?the?system?using.
>
>???then,
>
>???????how?can?we?set?the?CPU??into?Deeper?sleep?like?pxa270?we?can?change
>cpu?mode?by?writting?cp15?register
>
>?
>
>???we?check?the?datasheet?of?both?z5xx?and?SCH(us15wx)?,but?find?no
>description?of?how?can?we?generate?the?signals?which?can?force?CPU?enter
>Deeper?sleep.
>
>?
>
>_______________________________________________
>Moblin?dev?Mailing?List
>[email protected]
>
>To?manage?or?unsubscribe?from?this?mailing?list?visit:
>http://lists.moblin.org/listinfo/dev?or?your?user?account?on?http://moblin.org?once?logged?in.
>
>For?more?information?on?the?Moblin?Developer?Mailing?lists?visit:
>http://moblin.org/community/mailing-lists
_______________________________________________
Moblin dev Mailing List
[email protected]
To manage or unsubscribe from this mailing list visit:
http://lists.moblin.org/listinfo/dev or your user account on http://moblin.org
once logged in.
For more information on the Moblin Developer Mailing lists visit:
http://moblin.org/community/mailing-lists
