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Date: Sun, 6 Jul 2008 21:48:45 +0200 From: Pavel Machek <pavel@...e.cz> To: Arjan van de Ven <arjan@...ux.intel.com> Cc: Vegard Nossum <vegard.nossum@...il.com>, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: v2.6.26-rc7: Negative powertop values 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@...il.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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