From: Len Brown <lenb@kernel.org>
To: Tiago Marques <tiagomnm@gmail.com>
Cc: Thomas Renninger <trenn@suse.de>,
cpufreq@vger.kernel.org, discuss@lesswatts.org,
linux-pm@lists.linux-foundation.org, linux-acpi@vger.kernel.org
Subject: Re: Speedstep on Celeron SU2300 - 20% more battery lifetime on Windows
Date: Tue, 07 Sep 2010 12:20:44 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.00.1009071214360.22515@localhost.localdomain> (raw)
In-Reply-To: <AANLkTi==7HGa9OKUDq4cpexPpdPMKVgcXqONFL+UqmRe@mail.gmail.com>
> I'm getting around 75% in C4, the rest almost exclusively in C0.
This 25% in C0 is likely all of your battery life problem.
use top and powertop to find out what is running and why,
and see if it is something you can prevent from running.
If your CPU is more than 1% buys when "profoundly idle",
then it has a significant software or configuration problem.
cheers,
Len Brown, Intel Open Source Technology Center
ps. note for comparisons... your XP partition should have a
"perfmon" application that can draw a pretty graph of cpu usage,
including adding counters for the various C-states.
next prev parent reply other threads:[~2010-09-07 16:21 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTiktJ5Xgnsmq2je7T3Yc5Sf53Bu8vWMM1XT1V_vm@mail.gmail.com>
[not found] ` <201009020152.37466.trenn@suse.de>
[not found] ` <AANLkTi=WDEA+prG26g5R9oG1uZ7cNgaMrYDtug_LM7bY@mail.gmail.com>
[not found] ` <AANLkTi=WDEA+prG26g5R9oG1uZ7cNgaMrYDtug_LM7bY-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-09-06 8:35 ` Speedstep on Celeron SU2300 - 20% more battery lifetime on Windows Thomas Renninger
2010-09-06 15:47 ` [Discuss] " Arjan van de Ven
2010-09-06 22:03 ` Tiago Marques
2010-09-06 23:28 ` Arjan van de Ven
[not found] ` <4C85790A.50005-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2010-10-03 15:01 ` Tiago Marques
[not found] ` <AANLkTin5Kjiw+Z4F8Y+h+c0Qb_tu1o0SuwHEJ=R3iu40-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-10-03 15:03 ` Tiago Marques
2010-09-06 21:47 ` Tiago Marques
2010-09-07 11:47 ` Thomas Renninger
2010-10-03 15:06 ` Tiago Marques
2010-09-07 15:22 ` Matthew Garrett
2010-09-07 16:43 ` Thomas Renninger
2010-10-03 15:56 ` Tiago Marques
2010-10-03 15:45 ` Tiago Marques
2010-09-07 16:20 ` Len Brown [this message]
2010-10-03 15:47 ` Tiago Marques
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