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Message-ID: <e5bb8d810601131942r53712423kbd924757195f398b@mail.gmail.com>
Date: Fri, 13 Jan 2006 21:42:26 -0600
From: Philipp Rumpf <prumpf@gmail.com>
To: Dave Jones <davej@redhat.com>, Con Kolivas <kernel@kolivas.org>,
       ck list <ck@vds.kolivas.org>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.15-ck1
In-Reply-To: <20060104190554.GG10592@redhat.com>
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References: <200601041200.03593.kernel@kolivas.org>
	 <20060104190554.GG10592@redhat.com>
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Out of curiosity, why didn't you do the monitoring using
/proc/acpi/battery/.../{state,info} (while running off battery)?  I
think that should have much finer granularity, and avoid various
capacitors that might be in the way and explain the effect you
noticed.

I also tried something that sounds like dynticks a couple of years
back, but found that TCP timers made the really long idle times I was
looking for (my idea was actually to use the RTC to wake up the CPU)
impossible.

prumpf

On 1/4/06, Dave Jones <davej@redhat.com> wrote:
> On Wed, Jan 04, 2006 at 12:00:00PM +1100, Con Kolivas wrote:
>  >  +2.6.15-dynticks-060101.patch
>  >  +dynticks-disable_smp_config.patch
>  > Latest version of the dynticks patch. This is proving stable and effective on
>  > virtually all uniprocessor machines and will benefit systems that desire
>  > power savings. SMP kernels (even on UP machines) still misbehave so this
>  > config option is not available by default for this stable kernel.
>
> I've been curious for some time if this would actually show any measurable
> power savings. So I hooked up my laptop to a gizmo[1] that shows how much
> power is being sucked.
>
> both before, and after, it shows my laptop when idle is pulling 21W.
> So either the savings here are <1W (My device can't measure more accurately
> than a single watt), or this isn't actually buying us anything at all, or
> something needs tuning.
>
>                 Dave
>
> [1] http://www.thinkgeek.com/gadgets/electronic/7657/
>
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