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

    > 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:
    >
    > http://sysex.net/testing/2.6.12-RT-V0.7.50-17/xeonht/

    OK... Running on -50-17 with all RT debug except CONFIG_WAKEUP_TIMING and
    CONFIG_LATENCY_TIMING disabled. Max wakeup latency is 59us now, with a
    couple erroneous values of 2533412143us. VLC performance (streaming from
    a multicast UDP source) was great with one instance of burnP6 running.
    Running a second burnP6 along with VLC locks up the box (reproduceable) in
    about a minute. Running two or more instances of burnP6 without VLC does
    not result in any odd behavior or noticeably impact GUI performance. I
    rebuilt with CONFIG_DETECT_SOFTLOCKUP enabled, but couldn't catch a trace.

    FWIW, --ww
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