On Mon, 2006-06-12 at 11:20 +0200, Ingo Molnar wrote:
> * Sébastien Dugué <[email protected]> wrote:
>
> > > I think all of the regressions reported against rt1 are fixed, please
> > > re-report if any of them is still unfixed.
> >
> > Great, boots fine on my dual Xeon and solves the ping problem I was
> > having.
> >
> > Thomas, any hint at what was going on?
>
> the problem was caused by a mismerge of the __raise_softirq_irqoff()
> changes of preempt-softirqs. In PREEMPT_SOFTIRQS, softirq activation
> means a wakeup of the softirq thread - hence __raise_softirq_irqoff()
> must wake up the softirq thead too. This didnt happen in -rt1 so the
> network softirq (which processes things like ping reply packets) got
> delayed to the natural softirq event - the next timer interrupt in the
> usual case. Hence depending on HZ you got a delay of 1-4-10 msecs
> (divided into two parts).
>
Thanks.
Sébastien.
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