Messages in this thread | | | Date | Mon, 12 Jun 2006 11:20:23 +0200 | From | Ingo Molnar <> | Subject | Re: 2.6.17-rc6-rt3 |
| |
* Sébastien Dugué <sebastien.dugue@bull.net> 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).
Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |