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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00
    On Thu, 23 Jun 2005, Ingo Molnar wrote:

    > yes, very likely hardware (or system BIOS, e.g. SMM) induced.

    Running -50-17 on the Xeon/HT box, now with the ICH5 USB controller
    disabled in BIOS.

    The strangely regular ~200us idle jumps for both CPUs went away. Now I'm
    seeing one CPU at a time disappear (often completely absent) in the
    traces, with a the maximum wakeup generally hitting between 150us and
    300us. While compiling a kernel and running vlc (which would skip frames
    like mad, even with RR scheduling) I was able to get one trace of 2556us.

    There's also BUG warnings for update_out_trace(). I'm not quite sure if
    the trace behavior I'm seeing is related to this bug, but judging by the
    behavior of vlc, I wouldn't bet on it.

    Since the 2556us trace is quite large all the info is posted at:

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