svn commit: r274583 - head/usr.sbin/watchdogd

[Benjamin Kaduk]

On Sun, Nov 16, 2014 at 4:44 AM, Xin LI <delphij at freebsd.org> wrote:

> Author: delphij
> Date: Sun Nov 16 09:44:30 2014
> New Revision: 274583
> URL: https://svnweb.freebsd.org/changeset/base/274583
>
> Log:
>   Default to use 10 seconds as nap interval instead of 1.
>
>   Previously, we have a nap interval of 1 second while we have a timeout of
>   128 seconds by default, which could be an overkill, and for some hardware
>   the patting action may be expensive.
>
>   Note that the choice of nap interval is still arbitrary.  We preferred
>   a safe value where even when the system is very heavily loaded, the
>   watchdog should not shoot the system down if it's not really hung.
>   According to the manual page of Linux's watchdog daemon, the nap interval
>   time of theirs is 10 seconds, which seems to be a reasonable value --
>   according to Intel documentation AP-725 (Document Number: 292273-001),
>   ICH5's maximum timeout is about 37.5 seconds, which the ichwd(4) driver
>   would set when we requested 128 seconds (although it should probably
>   feed back this as an error and do not set the timeout).  Since that's
>   the shortest maximum value, 10 seconds seems to be a right choice for
>   us too.
>
>   Discussed with:       alfred
>   MFC after:    1 month
>

relnotes: yes?

-Ben