Date: Wed, 4 Jan 2006 14:05:54 -0500
From: Dave Jones <davej@redhat.com>
To: Con Kolivas <kernel@kolivas.org>
Cc: ck list <ck@vds.kolivas.org>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.15-ck1
Message-ID: <20060104190554.GG10592@redhat.com>
Mail-Followup-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>
References: <200601041200.03593.kernel@kolivas.org>
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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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