Re: 2.6.19-rc2-mm1

Andrew Morton
2006-10-18T23:25:20Z

On Wed, 18 Oct 2006 16:01:05 -0700
Badari Pulavarty <pbadari@us.ibm.com> wrote:

> > Is the NMI watchdog ticking over?
>
> I think so.
>
> # dmesg | grep NMI
> ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
> ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
> ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
> ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
> testing NMI watchdog ... OK.

What does it say in /proc/interrupts?

The x86_64 nmi watchdog handling looks rather complex.

<checks a couple of x86-64 machines>

The /proc/interrutps NMI count seems to be going up by about
one-per-minute. How odd. Maybe you just need to wait longer.

Or try booting with nmi_watchdog=2 (Documentation/x86_64/boot-options.txt).

There's an empty directory /sys/devices/system/lapic_nmi/lapic_nmi0/. I
wonder what that does?