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    SubjectRe: PREEMPT_RT vs I-PIPE: the numbers, part 2
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    On Wed, 2005-06-22 at 11:31 -0400, Karim Yaghmour wrote:
    > max_ipipe_delay = 27.5us
    > average_ipipe_delay = 7us
    > max_preempt_delay = 55us - max_ipipe_delay = 27.5us
    > average_preempt_delay = 14 us - average_ipipe_delay = 7us

    Ingo, what's the status of putting irq 0 back in a thread with
    PREEMPT_RT? IIRC this had some adverse (maybe unfixable?) effects so it
    was disabled a few months ago.

    I don't think there's much point in comparing i-pipe to PREEMPT_RT if we
    know that 21usec pipeline effect from the timer IRQ (see list archives)
    is still there.

    Lee

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