Date: Sat, 8 May 2010 07:26:55 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: rihad <rihad@mail.ru> Cc: freebsd-stable@freebsd.org Subject: Re: Enabling watchdog Message-ID: <20100508142655.GA90968@icarus.home.lan> In-Reply-To: <4BE561C7.70702@mail.ru> References: <4BE561C7.70702@mail.ru>
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On Sat, May 08, 2010 at 06:06:15PM +0500, rihad wrote: > Hi, I'm thinking of enabling the watchdog on our Dell PowerEdge 2950 > / FreeBSD 8.0 amd64, so that it reboots the machine in case of > lockups. > Right now it doesn't work: > > # watchdog > watchdog: patting the dog: Operation not supported > # This is almost certainly a failed WDIOCPATPAT ioctl() call, indicating you don't have support for watchdog stuff in your kernel. Once you add that, be aware you'll need to run watchdogd(8) as well. > Looking through the kernel configuration I found two relevant settings: > In /sys/conf/NOTES: > # > # Add software watchdog routines. > # > options SW_WATCHDOG > > > and in /sys/amd64/conf/NOTES: > # > # Watchdog routines. > # > options MP_WATCHDOG > > > Which of them should I rebuild the kernel with? BTW, the existing > kernel is built with the default "options SCHED_ULE" to make good use > of multiple CPUs, does watchdog work with it? I think what you want is SW_WATCHDOG, but I have no idea if this works properly or effectively on multiprocessor machines. MP_WATCHDOG may address that, but does not work with SCHED_ULE[1]. I would recommend reading the watchdog(4) and watchdogd(8) man pages. I would also recommend reading [2], since it sheds some light on how MP_WATCHDOG works. [1]: See src/sys/amd64/amd64/mp_watchdog.c, around line 32. There's an #error statement that gets hit if SCHED_ULE is used. [2]: See src/sys/amd64/amd64/mp_watchdog.c, around line 51. There's a large comment explaining what MP_WATCHDOG does. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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