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SubjectRe: [RFC] Fix NMI watchdog documentation
Zwane Mwaikambo wrote:
> On Sat, 24 May 2003, Zwane Mwaikambo wrote:
>>For nmi_watchdog=1 the NMI watchdog uses the programmable interval timer
>>to trigger interrupt events via the IOAPIC. with nmi_watchdog=2 we use the
>>performance counters on the processor to trigger these events. IOAPICs
>>are generally found on SMP motherboards (but there are UP boards with
>>them, it's chipset dependent). Generally i686+ (save some Athlons and a
>>few other processors) will work with nmi_watchdog=2.
> Forgot this bit;
> w/ CONFIG_X86_LOCAL_APIC=y you only have nmi_watchdog=2
> w/ CONFIG_X86_IO_APIC=y you have nmi_watchdog=1 and 2
> w/ CONFIG_SMP you have nmi_watchdog=1 and 2 as it depends on

Marc-Christian Petersen wrote:
> the nmi_watchdog is always compiled in if you select "CONFIG_X86_LOCAL_APIC"
> see "arch/i386/kernel/Makefile"

Thanks to all who responded. I will prepare a patch for
Documentation/nmi_watchdog.txt to clarify it and send the patch to Linus
and Marcelo.


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