Re: [RFC] Fix NMI watchdog documentation

[Carl-Daniel Hailfinger <c-d.hailfinger.kernel.2003@gmx.net>]

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 
> CONFIG_X86_IO_APIC

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.


Regards,
Carl-Daniel
-- 
http://www.hailfinger.org/