From: Pavel Machek <pavel@suse.cz>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>,
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
Date: Sun, 6 Jul 2008 21:48:45 +0200 [thread overview]
Message-ID: <20080706194845.GA5617@ucw.cz> (raw)
In-Reply-To: <20080621141615.51f7100c@linux.intel.com>
On Sat 2008-06-21 14:16:15, Arjan van de Ven wrote:
> 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]
We should really fix that one day...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2008-07-08 13:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-21 19:16 Vegard Nossum
2008-06-21 21:16 ` Arjan van de Ven
2008-06-21 21:22 ` Vegard Nossum
2008-07-06 19:48 ` Pavel Machek [this message]
2008-07-08 13:52 ` Arjan van de Ven
2008-07-13 11:58 ` Pavel Machek
2008-07-13 15:35 ` Arjan van de Ven
2008-07-14 6:26 ` Pavel Machek
2008-07-13 15:37 ` Arjan van de Ven
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