Re: why are the watchdog drivers blacklisted?
On Tue, 09 Feb 2010, Michael Meskes wrote:
> TOn Mon, Feb 08, 2010 at 11:44:55PM -0200, Henrique de Moraes Holschuh wrote:
> > And while at it, change wd_keepalive and watchdog to default to pat at 1Hz
> > instead of 0.1Hz. That will reduce a _lot_ the changes of spurious
> > reboots.
> This looks like a workaround for some other problem to me. Patting at 0.1Hz
> should be sufficient if the kernel expects a change at 0.016 Hz. I don't have
> any report about a spurious reboot, but if you do have some I'd like to learn
> more about it to see where this problem stems from.
The kernel drivers don't always expect pats at 0.016Hz by default. Some
drivers have different defaults, and as far as I recall, some of them
default to whatever the BIOS or BMC programmed in the watchdog.
A period of 1s would be a much safer default on the userland side.
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