linux-kernel - v2.6.26-rc7: Negative powertop values

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Date:	Sat, 21 Jun 2008 21:16:37 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Arjan van de Ven" <arjan@...ux.intel.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: v2.6.26-rc7: Negative powertop values

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:

    Cn                Avg residency       P-states (frequencies)
    C0 (cpu running)        (105.5%)        1467 Mhz    80.7%
    C1                0.0ms ( 0.0%)         1067 Mhz     0.4%
    C2                0.0ms ( 0.0%)          800 Mhz    19.0%
    C3                0.0ms (1288344194138.5%)

    Wakeups-from-idle per second : -6.2     interval: 2.0s


    # cat /proc/schedstat
    version 14
    timestamp 811305
    cpu0 0 0 0 545 0 5733898 257804 3325833 3064649 6916730262519
21980606970853 5438836
    domain0 <NULL> 1514 1081 425 452096 12 10 0 1081 91 91 0 0 0 0 0
91 5916 4168 1715 1859096 34 13 4 4164 4 0 4 0 0 0 0 0 0 1013 18883 0
    cpu1 0 0 0 1279 0 12508366 1294362 7173738 6484092 1515315020607
22231002791887 11146865
    domain0 <NULL> 313 219 88 154083 10 3 0 219 104 104 0 527 0 0 0
104 1077 894 163 467031 41 5 0 894 1 0 1 0 0 0 0 0 0 455 14689 0


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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