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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00

    * K.R. Foley <kr@cybsft.com> wrote:

    > Just had an opportunity to check this. Everything does indeed seem to
    > be working OK with this disabled. No lock up messages, no perceived
    > problems.

    btw., you have this enabled in your config:

    CONFIG_DEBUG_RT_LOCKING_MODE=y

    this causes old-style spinlocking to be activated by default. I.e. you
    dont get most of the benefits of PREEMPT_RT. You can reactivate it via:

    echo 1 > /proc/sys/kernel/preempt_locks

    but obviously this runtime flag involves some runtime overhead in the
    locking code. This .config option is mainly meant to enable the
    measurement of the locking overhead of PREEMPT_RT, and to debug boot
    problems that might be related to PREEMPT_RT locking. So you'd almost
    always want to run with DEBUG_RT_LOCKING_MODE turned off.

    Ingo
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