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    SubjectRe: Serial port latency
    Date
    From: "Pavel Machek" <pavel@suse.cz>
    > > Is the computer otherwise idle?
    > > I've seen one unexplainable report with atm problems that
    disappeared
    > > (!) if a kernel compile was running.
    >
    > I've seen similar bugs. If you hook something on schedule_tq and
    forget
    > to set current->need_resched, this is exactly what you get.
    >
    I'm running with a patch that printk's if cpu_idle() is called while a
    softirq is pending.
    If I access the floppy on my K6/200 every track triggers the check, and
    sometimes the console blanking code triggers it.

    What about creating a special cpu_is_idle() function that the idle
    functions must call before sleeping?

    --
    Manfred

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