On Wed, 2007-02-21 at 20:23 +0100, Thomas Gleixner wrote:
quoted text
> On Wed, 2007-02-21 at 10:23 -0800, Daniel Walker wrote:
> > Right, but eventually there isn't a regular timer interrupt through the
> > io-apic. I don't think in the past IRQ0 stops without the system
> > crashing, so check_timer() could assume the timer (IRQ0) is _always_
> > regular.
> > 
> > do you know what the requirement are for routing the NMI through the
> > io-apic? 
> 
> Sorry. I checked. switching PIT off really breaks nmi_watchdog=1, as
> this just mirrors IRQ#0 to the NMI. No IRQ#0 from PIT, no NMI
> 
> We could keep PIT running with an empty interrupt handler when
> nmi_watchdog=1 is set, but this interferes nicely with broadcasting.
> 
> Does nmi_watchdog=2 work ? We might switch to that, when a local APIC is
> available. 
> 
> 	tglx
> 
> 


There's a compile failure during my bisect.

distcc[3863] ERROR: compile /tmp//hrtimer.tmp.dwalker1.3795.i on dwalker3/120 failed
kernel/hrtimer.c: In function 'hrtimer_cpu_notify':
kernel/hrtimer.c:884: warning: implicit declaration of function 'clockevents_notify'
kernel/hrtimer.c:884: error: 'CLOCK_EVT_NOTIFY_CPU_DEAD' undeclared (first use in this function)
kernel/hrtimer.c:884: error: (Each undeclared identifier is reported only once 
kernel/hrtimer.c:884: error: for each function it appears in.)
drivers/ide/setup-pci.c: In function 'ide_scan_pcibus':
drivers/ide/setup-pci.c:866: warning: ignoring return value of '__pci_register_driver', declared with attribute warn_unused_result
make[1]: *** [kernel/hrtimer.o] Error 1


from this commit,

commit f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98
Author: Thomas Gleixner <tglx@linutronix.de>
Date:   Fri Feb 16 01:28:02 2007 -0800

    [PATCH] tick-management: broadcast functionality
    
    With Ingo Molnar <mingo@elte.hu>
    
    Add broadcast functionality, so per cpu clock event devices can be registere
    as dummy devices or switched from/to broadcast on demand.  The broadcast
    function distributes the events via the broadcast function of the clock even
    device.  This is primarily designed to replace the switch apic timer to / fr
    IPI in power states, where the apic stops.
    


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