Watchdog Timers
Timer Type
Description
ichlpcib0
This is a PCI hardware watchdog timer. It is generally immediately available after
boot, however, may be unusable because of hardware limitations. In such an
instance, the kernel prints out a message to the boot log which loads the
software watchdog instead. This watchdog has a single timer, and causes a CPU
reset when the watchdog has not been tickled for <timer> seconds.
ipmi0
This is an Intelligent Platform Management Interface (IPM)I hardware watchdog
timer. It is not available until several seconds after the boot process is complete.
There are two timers for this watchdog: an
NMI timer
and a
reset timer
.
An
NMI timer
is generated when the watchdog has not been tickled for <NMI
timer> seconds.
A CPU
reset
is generated when the watchdog has not been tickled for <reset
timer> seconds. The idea is that you can configure your system to panic (using
an NMI watchdog) and then several seconds later reboot (using a CPU reset).
The following rules apply:
reset = 0, nmi => 0: the watchdog is not armed (i.e. if the reset
timer is 0, the nmi value does not matter)
reset > 0, nmi = 0: The system will reset the CPU <reset>
seconds after the timer stops being tickled. (This is the default
behavior, reset = 30).
reset > 0, nmi > 0, reset < nmi: The system will generate an NMI
<nmi> seconds after the timer stops being tickled. No CPU reset
is ever asserted.
reset > 0, nmi > 0, reset > nmi: The system will generate an NMI
<nmi> seconds after the timer stops being tickled. It will reset
the CPU <reset> seconds after the timer stops being tickled.
(Note: Not <reset> seconds after <nmi>). The NMI timer is con-
trolled via the sysctl: hw.ipmi0.pretimeout.
swwdog0: This is a NetBSD software watchdog. It is always avail-
able, however, requires the kernel to be operational. If the kernel
is "locked up", the watchdog may not fire. It has a single timer,
and causes a panic when it has not been tickled for <timer>
seconds.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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Equalizer Administration Guide
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