On 1/23/2013 7:25 AM, John Baldwin wrote:
On Tuesday, January 22, 2013 5:40:55 pm Sushanth Rai wrote:
Hi,
Does freebsd have some functionality similar to Linux's NMI watchdog ? I'm
aware of ichwd driver, but that depends to WDT to be available in the
hardware. Even when it is available, BIOS needs to support a mechanism to
trigger a OS level recovery to get any useful information when system is
really wedged (with interrupt disabled)
The principle purpose of a watchdog is to keep the system from hanging.
Information is secondary. The ichwd driver can use the LPC part of ICH
hardware that's been there since ICH version 4. I implemented this more
fully at Panasas. The first importance is to keep the system from being
hung. The next piece of information is to detect, on reboot, that a
watchdog event occurred. Finally, trying to isolate why is good.
This is equivalent to the tco_WDT stuff on Linux. It's not interrupt
driven (it drives the reset line on the processor).
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