Date: Thu, 02 Apr 2009 14:28:47 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-hackers@FreeBSD.org Subject: watchdog: hw+sw? Message-ID: <49D4A16F.6020906@icyb.net.ua>
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I have some vague thoughts on using SW_WATCHDOG and a hardware watchdog together. I think this could be useful but I am not sure how to implement this. The idea is this: timeout for SW_WATCHDOG is smaller than timeout for hw wd; when some freeze happens sw wd logic kicks in first, stops hw wd and produces either panic or ddb prompt; if the freeze is so severe that sw wd can't run (e.g. hardware is messed up badly) then hw wd performs its duty. I am mostly interested in having this in unattended mode where kernel dump could be useful for later analysis but the system should recover in reasonable time. Suggestions, opinions? Thank you! -- Andriy Gapon
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