Date: Sun, 4 Feb 1996 16:48:44 +0200 (EET) From: Heikki Suonsivu <hsu@clinet.fi> To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) Cc: freebsd-hackers@freebsd.org Subject: Re: Watchdog timers Message-ID: <199602041448.QAA23064@newzetor.clinet.fi> In-Reply-To: J Wunsch's message of 2 Feb 1996 23:43:36 %2B0200 References: <199602021020.LAA04930@uriah.heep.sax.de>
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In article <199602021020.LAA04930@uriah.heep.sax.de> J Wunsch <j@uriah.heep.sax.de> writes:
Idea stolen from Linux: create a /dev/watchdog for this purpose. Once
it is held open by a process, the kernel resets the CPU if it doesn't
get a response on a device after a certain time.
The idea behind this is that most of the hanging systems have still a
running async portion of the kernel, i.e. things like interrupt
handling continue to work, but the process context switching hangs for
some reason (e.g. SCSI bus hangs etc.). The chances are good that the
kernel could still kill itself.
Metoo, would save a lot of trouble for us. We try to use FreeBSD on big
servers, and it seems hopeless, the more load the more it locks up (daily
for the most loaded server)!
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@clinet.fi work +358-0-4375209 fax -4555276 home -8031121
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