From: Matthew Garrett <mjg59@srcf.ucam.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, 7 Sep 2010 16:22:46 +0100 [thread overview]
Message-ID: <20100907152246.GA12326@srcf.ucam.org> (raw)
In-Reply-To: <AANLkTi==7HGa9OKUDq4cpexPpdPMKVgcXqONFL+UqmRe@mail.gmail.com>
On Mon, Sep 06, 2010 at 10:47:58PM +0100, Tiago Marques wrote:
> Yes, but shouldn't it detect P-States with different voltages, as in
> windows? (even as stupid as this sounds) I sure loved to get it always
> stuck at the lower clock, given that I usually perform maintenance on
> PCs I highly doubt the fan would get dust clogged to the point of
> taking the CPU to temperatures that would cause problems.
> This looks like it doesn't support Speedstep even though Intel says it
> does but the fact is that Windows can work with two voltages, which
> always improves power.
If there's only one frequency then there's no reason to have multiple
voltages - the voltage will already be at the minimum possible for the
core to be stable at that frequency. Entering C4 will typically result
in the voltage dropping as parts of the core are disabled.
Does your chip have the "est" flag in /proc/cpuinfo? If not, it doesn't
support speedstep.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2010-09-07 15:22 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 [this message]
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
2010-10-03 15:47 ` Tiago Marques
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