Date: Sat, 21 Jun 2008 14:16:15 -0700
From: Arjan van de Ven <arjan@linux.intel.com>
To: "Vegard Nossum" <vegard.nossum@gmail.com>
Cc: "Ingo Molnar" <mingo@elte.hu>, "Peter Zijlstra" <a.p.zijlstra@chello.nl>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: v2.6.26-rc7: Negative powertop values
Message-ID: <20080621141615.51f7100c@linux.intel.com>
In-Reply-To: <19f34abd0806211216y4695c532ndb4935082bd8ea1@mail.gmail.com>
References: <19f34abd0806211216y4695c532ndb4935082bd8ea1@mail.gmail.com>
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On Sat, 21 Jun 2008 21:16:37 +0200
"Vegard Nossum" <vegard.nossum@gmail.com> wrote:

> Hi,
> 
> I was testing v2.6.26-rc7 by running lmbench and hotplug/-unplugging
> CPUs and a few other programs at the same time. Powertop was showing a
> negative number of wakeups/second and average C3 residency was
> something really insane. Is there anything strange with this schedstat
> file, or is there another file I should look at that can explain the
> strange powertop numbers? Or maybe it's just an artifact of powertop
> and this has nothing to do with the kernel?

powertop doesn't assume you do cpu hotunplug (and the internal state
goes wacky if you do).

[I assume you know that doing a software unplug you burn more power
than by leaving the cpu idle]


-- 
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