From: "Michael (Micksa) Slade" <micksa@knobbits.org>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Inspiron 6000 and CPU power saving
Date: Sat, 21 Oct 2006 21:45:44 +1000 [thread overview]
Message-ID: <453A0868.307@knobbits.org> (raw)
In-Reply-To: <EB12A50964762B4D8111D55B764A8454C1A3F3@scsmsx413.amr.corp.intel.com>
Pallipadi, Venkatesh wrote:
>
>
>
>
>>-----Original Message-----
>>From: linux-kernel-owner@vger.kernel.org
>>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of
>>Michael (Micksa) Slade
>>Sent: Sunday, October 15, 2006 7:18 PM
>>To: linux-kernel@vger.kernel.org
>>Subject: Inspiron 6000 and CPU power saving
>>
>>I recently discovered that my Inspiron 6000 uses about 50% more power
>>idling in linux than in windows XP. This means its battery life is
>>about 2/3 of what it could/should be.
>>
>>I guessed it might be the CPU, and did some tests. The
>>results strongly
>>suggest as much. These are the results I got for power consumption in
>>various situations.
>>
>>linux idle at 800MHz: 27W
>>linux idle at 1600MHz: 36W
>>linux raytracing at 800: 30W
>>linux raytracing at 1600: 42W
>>
>>windows idle (presumably 800MHz): 16W
>>windows raytracing (presumably 1600MHz): 36W
>>
>>I've tried ubuntu dapper and ubuntu edgy, and RIP 10 (rescue disk) and
>>BBC 2.1 (rescue disk), and they all appear to have the same
>>issue. The
>>machine's BIOS has no APM so I can't try it for comparison.
>>
>>I've tried noapic and "echo n >
>>/sys/module/processor/parameters/max_cstate", where n is 1 thru 4.
>>Neither appear to have any affect.
>>
>>I need help digging deeper. I guess /proc/acpi/processor/CPU0/power
>>could give some insight but I'm not sure how to read the
>>numbers. That
>>and "learn about ACPI" is all I can figure out so far.
>>
>>So where to from here? I am prepared to spend a significant amount of
>>time researching and resolving the issue, so feel free to suggest
>>reading the ACPI spec or whatever if that's what it's going to take.
>>
>>Mick.
>>
>>
>>
>
>Output of
>#cat /proc/acpi/processor/CPU0/power/*
>And
>#cat /sys/devices/system/cpu/cpu0/cpufreq/*
>Will be a good starting point.
>
>Also, open a issue at bugme.osdl.org. It makes tracking the issues
>easier that way.
>
>Thanks,
>Venki
>
>
Done.
http://bugzilla.kernel.org/show_bug.cgi?id=7393
As part of this I've also tried vanilla 2.6.19-rc2 and done another
small test. See the report.
Mick.
next prev parent reply other threads:[~2006-10-21 11:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-19 17:26 Inspiron 6000 and CPU power saving Pallipadi, Venkatesh
2006-10-21 11:45 ` Michael (Micksa) Slade [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-10-16 2:18 Michael (Micksa) Slade
2006-10-17 8:07 ` Oleg Verych
2006-10-25 9:47 ` Pavel Machek
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