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Date: Tue, 23 Sep 2008 14:59:59 -0400
From: Masami Hiramatsu <mhiramat@redhat.com>
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To: Thomas Gleixner <tglx@linutronix.de>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
       Mathieu Desnoyers <compudj@krystal.dyndns.org>,
       Martin Bligh <mbligh@google.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Steven Rostedt <rostedt@goodmis.org>, darren@dvhart.com,
       "Frank Ch. Eigler" <fche@redhat.com>,
       systemtap-ml <systemtap@sources.redhat.com>
Subject: Re: Unified tracing buffer
References: <33307c790809191433w246c0283l55a57c196664ce77@mail.gmail.com> <48D7F5E8.3000705@redhat.com> <33307c790809221313s3532d851g7239c212bc72fe71@mail.gmail.com> <48D81B5F.2030702@redhat.com> <33307c790809221616h5e7410f5gc37c262d83722111@mail.gmail.com> <48D832B6.3010409@redhat.com> <33307c790809221712x4fbd9781u958c98d4585e92a9@mail.gmail.com> <48D901FE.5060604@redhat.com> <20080923150410.GA28341@Krystal> <48D90B84.4030905@redhat.com> <alpine.LFD.1.10.0809230847360.3265@nehalem.linux-foundation.org> <48D921B3.2060809@redhat.com> <alpine.LFD.1.10.0809231927060.2038@apollo.tec.linutronix.de>
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Hi Thomas,

Thomas Gleixner wrote:
> 
> Do you have C-States enabled on that machine ?
> 
> ls /sys/devices/system/cpu/cpu0/cpuidle/
> 
> has it more than a state0 entry ?

Yes, there are state0 to state3
# ls /sys/devices/system/cpu/cpu0/cpuidle/
state0  state1  state2  state3

> If yes, please do:
> 
> cat /sys/devices/system/cpu/cpu0/cpuidle/stateX/usage
> 
> where X is the highest number in there.

# cat /sys/devices/system/cpu/cpu0/cpuidle/state3/usage
171210

> 
> cat /proc/acpi/processor/CPU0/power
> 
> might be useful as well.

# cat /proc/acpi/processor/CPU0/power
active state:            C0
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 2000000000 usec
states:
    C1:                  type[C1] promotion[--] demotion[--] latency[001] usage[00000016] duration[00000000000000000000]
    C2:                  type[C2] promotion[--] demotion[--] latency[001] usage[00037969] duration[00000000000024288003]
    C3:                  type[C3] promotion[--] demotion[--] latency[057] usage[00171818] duration[00000000001881257636]

Could these help you?

Thank you,

> 
> Thanks,
> 
> 	tglx

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com