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* Thomas Gleixner <tglx@timesys.com> wrote: > > Disabling NO_HZ and high resolution timers due to timer broadcasting > > > > Not sure exactly what this is indicating or what's triggered this, but > > I'm assuming the patch isn't doing much on this machine? > > The system is configured for SMP, but this is an UP machine and the > APIC is disabled in the BIOS. Linux uses then the PIT and an IPI > mechanism to broadcast timer events. We need to do the event > reprogramming per CPU, so we switch off in that situation. hm, we should update the message to be less cryptic. Something like: 'Disabling NO_HZ and high resolution timers due to no APIC' and in this particular case we should also finetune the condition a bit and make it conditional on the number of CPUs. I.e. if someone boots an SMP kernel on a UP box we should still allow the PIT. (there wont be any broadcasting done) [the only exception would be if CONFIG_HOTPLUG_CPU is specified - in that case we cannot be sure whether a new CPU will be plugged in or not] 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/ | ||||||||||||
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