From: Bas Mevissen <ml@basmevissen.nl>
To: Jan Rychter <jan@rychter.com>
Cc: cpufreq@www.linux.org.uk
Subject: Re: Pentium-M (Centrino): no power saved?
Date: Tue, 23 Sep 2003 10:51:01 +0200 [thread overview]
Message-ID: <3F700975.9090402@basmevissen.nl> (raw)
In-Reply-To: <m24qz4lgm9.fsf@tnuctip.rychter.com>
Jan Rychter wrote:
>>>>>>>>"Bas" == Bas Mevissen <ml@basmevissen.nl> writes:
>>
>>
>>Do you measure this from the ACPI battery output?
>
> Yes.
>
OK. Do you know of a way to see the power usage when on AC-adapter? I'm
wondering if there isn't something in the on-board power circuit to see
the actual power usage of the PC or just CPU or motherboard.
> No, I have verified this (with bogomips) and the above results are
> true. The CPU does indeed slow down properly as directed by
> cpufreq. Also, in my case connecting and disconnecting the AC adapter
> doesn't change the CPU speed.
>
> So, the results still hold -- and it seems it simply doesn't make much
> sense to slow down a Pentium-M, unless you really keep the CPU busy?
>
Very interesting conclusion. It could mean three things:
1) The internal power management of the Pentium-M (when using APM or
ACPI idle calls) is very good
2) The speedstepping of the Pentium-M doesn't bring enough
3) We are interpreting something wrong :-)
From your conclusions, 1) would be the most reasonable and most
favourable result.
Bas.
next prev parent reply other threads:[~2003-09-23 8:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 2:09 Pentium-M (Centrino): no power saved? Jan Rychter
2003-09-19 8:24 ` Bas Mevissen
2003-09-19 8:36 ` Mattia Dongili
2003-09-19 9:22 ` Bas Mevissen
2003-09-19 17:15 ` Toula Michael
2003-09-19 9:23 ` Bas Mevissen
2003-09-21 6:50 ` Jan Rychter
2003-09-22 8:00 ` Bas Mevissen
2003-09-22 20:20 ` Jan Rychter
2003-09-23 8:51 ` Bas Mevissen [this message]
2003-09-19 11:46 ` Ducrot Bruno
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