The best APIC documentation are the old data sheets for the external APIC chips. I don't know if they cover things in such detail.
> In this case the latter NMI will actually have an overflow state to > process so it's not a spurious NMI. But we cannot distinguish it right? The spurious detector would trigger in any case. > > > And if we're in a state that PMIs get re-raised quickly, we should either > > regulate the period down or start throttling. > > It could be a different counter; where both run at 'normal' periods but > just near miss each other by accident. That's true. It would be only a problem if they somehow become synchronized that this happens very commonly. The usual defense against things like that is to add a little randomization (I remember Stephane had a patch for that some time ago). Also I believe it helps to have the periods be prime numbers. But right now don't have any evidence it's a real problem. I presume there's enough noise on a typical setup that any such states disappear again quickly enough. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
