> On Wed, Nov 06, 2002 at 11:49:07AM -0800, george anzinger wrote:
>
> > So the performance counters are only used on UP machines?
>
> no. nmi_watchdog=1 -> I/O APIC is used iff available and it works
> nmi_watchdog=2 -> local APIC LVTPC set to interrupt in NMI mode when
> perfctr overflows.
>
> =2 can be used on both UP and SMP, =1 is only available on UP for the
> rare machines that have an I/O APIC on a UP motherboard (I believe there
> are some, but I don't know if the code is set up to do so properly).
By any chance, does this implementation imply that if I boot SMP with
'noapic' the NMI watchdog won't work? It doesn't, but I am not sure I had
it on before I turned off the APIC.
Clearly this would be desirable to work, as noapic is needed on a fairly
large minority of machines.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.- 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/