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Message-ID: <20080621141615.51f7100c@linux.intel.com> Date: Sat, 21 Jun 2008 14:16:15 -0700 From: Arjan van de Ven <arjan@...ux.intel.com> To: "Vegard Nossum" <vegard.nossum@...il.com> Cc: "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, 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] -- If you want to reach me at my work email, use arjan@...ux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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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