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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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