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SubjectRe: softirq buggy [Re: Serial port latency]
Date
From: <kuznet@ms2.inr.ac.ru>
> Hello!
>
> > + if (softirq_active(smp_processor_id()) &
softirq_mask(smp_processor_id())) {
> > + do_softirq();
> > + return 0;
>
> BTW you may delete do_softirq()... schedule() will call this.
>

But with a huge overhead. I'd prefer to call it directly from within the
idle functions, the overhead of schedule is IMHO too high.

>
> > + *
> > + * Isn't this identical to default_idle with the 'no-hlt' boot
> > + * option? <manfred@colorfullife.com>
>
> Seeems, it is not. need_resched=-1 avoids useless IPIs.
>
I already wondered why need_resched is set to -1 ;-)

I'll remove that comment and repost the patch.

--
Manfred

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