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    SubjectRe: [PATCH] clocksource: Load the ACPI PM clocksource asynchronously
    On Sun, 8 Apr 2012 19:20:22 -0700, Arjan van de Ven wrote:

    >> to which I bisected as the culprit for very strange load balance
    >> behavior on my machine.
    >> With this patch in place, my CPU is constantly being pegged at 100%
    >> (and my CPU monitor sometimes registers NaN%), regardless of the
    >> active governor and under conditions when my computer would normally
    >> be idling quite placidly.
    >> Reverting this commit does indeed remove the problem from previously
    >> problematic builds.
    > any chance of a dmesg? (or even better, a diff of the dmesg from
    > abefore and fter)

    Doh! I should have thought of that.

    The dmesg output for a kernel built from your patch's commit yields
    this interesting line:

    PM-Timer running at invalid rate: 113% of normal - aborting.

    That certainly sounds unsavory!

    Here is some other, probably uninteresting context:

    --- good-dmesg.txt
    +++ bad-dmesg.txt
    Initializing cgroup subsys cpu
    -Linux version 3.3.0-rc1-good-12d6d41276def096cb3f7dc36f438db9ed6a0a8d+ [...]
    +Linux version 3.3.0-rc1-bad-b519508298e0292e1771eecf14aaf67755adc39d+ [...]
    Fast TSC calibration using PIT
    -Detected 798.093 MHz processor.
    +Detected 798.071 MHz processor.
    -Calibrating delay loop (skipped), value calculated using timer frequency.. 1596.18 BogoMIPS (lpj=798093)
    +Calibrating delay loop (skipped), value calculated using timer frequency.. 1596.14 BogoMIPS (lpj=798071)
    pid_max: default: 32768 minimum: 301
    Mount-cache hash table entries: 512
    Initializing cgroup subsys cpuacct
    system 00:0c: Plug and Play ACPI device, IDs PNP0c01 (active)
    pnp: PnP ACPI: found 13 devices
    ACPI: ACPI bus type pnp unregistered
    -Switching to clocksource acpi_pm
    +PM-Timer running at invalid rate: 113% of normal - aborting.

    Michael Witten


    I'm terribly sorry for the delayed reply; Gmail somehow managed to
    throw away this thread entirely (actually, I probably threw it away,
    but I'm content to blame my tools; after all, they can't deny it!).

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