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    SubjectRe: 20000+ wake-ups/second in 2.6.24. Bug?
    On Mon, 04 Feb 2008 12:29:03 -0500
    Mark Lord <lkml@rtr.ca> wrote:

    > re: http://bugzilla.kernel.org/show_bug.cgi?id=9489
    >
    > This just happened here again. Or at least I finally noticed that
    > the fan on my notebook seemed to be running hard for much longer
    > than usual. :)
    >
    > Powertop showed 2.6.24-final running with 10000-36000 wakeups/sec,
    > with *nothing* significant running: top showed 97+% idle on both
    > cores.
    >
    > - Device: Errors: Correctable- Non-Fatal- Fatal+
    > Unsupported-
    > + Device: Errors: Correctable+ Non-Fatal+ Fatal+
    > Unsupported+ Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
    > Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
    > Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1,
    > Port 1 @@ -101,12 +101,12 @@
    > Latency: 0, Cache Line Size: 64 bytes
    > Bus: primary=00, secondary=0c, subordinate=0c, sec-latency=0
    > Memory behind bridge: efc00000-efcfffff
    > - Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast
    > >TAbort- <TAbort- <MAbort- <SERR- <PERR-
    > + Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast
    > >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+
    > >NoISA- VGA- MAbort- >Reset- FastB2B-

    this shows you're having various types of really bad things going on, like PCI
    master aborts and the like. Those would certainly be a factor in waking the cpu up;
    they're basically hardware exceptions, and I can totally believe (would need to find out
    from hw guys how this works in practice) that this sort of serious error would keep the
    cpu out of deep C states until resolved.


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