On Wed, 2007-02-21 at 09:38 -0800, Daniel Walker wrote:
> > >
> > > Could be the switch over then which confuses the NMI .
> >
> > Why? The switch just stops the PIT/HPET. It does not fiddle with IO_APIC
> > and friends at all.
>
> I'm not an expert on the io-apic, but the check_timer() function seemed
> to assume IRQ0 was happening regularly ..
Again:
check_timer() is called _BEFORE_ we even touch the local APIC timers. At
this point PIT/HPET _IS_ firing IRQ0 with HZ frequency.
> Well, I'm pretty sure it's HRT, cause in prior versions this only
> happened when HRT is enabled. Then you guys went to the lapic all the
> time, and now this is happening all the time ..
The NMI is stuck:
if (nmi_count(cpu) - prev_nmi_count[cpu] <= 5) {
printk("CPU#%d: NMI appears to be stuck (%d->%d)!\n",
cpu,
prev_nmi_count[cpu],
nmi_count(cpu));
This has nothing to do with jiffies.
There have been a bunch of changes in arch/i386/kernel/nmi.c as well.
> You can't reproduce this?
Nope.
Also all my machines emit something like:
"ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])"
In your boot log nothing to see.
tglx
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