Date: Tue, 3 Jun 2008 10:12:10 +0200 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-questions@freebsd.org Cc: Jeremy Karlson <karlj000@unbc.ca> Subject: Re: 7-STABLE Watchdog Timeout Message-ID: <200806031012.12180.pieter@degoeje.nl> In-Reply-To: <DD3BA921-68E2-494C-8DFA-98CC6EDA4447@unbc.ca> References: <164F5576-6023-4873-A1FE-CBAFD2E612A4@unbc.ca> <DE94F570-73F1-4F00-961F-4DF9C4287C86@unbc.ca> <DD3BA921-68E2-494C-8DFA-98CC6EDA4447@unbc.ca>
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On Tuesday 03 June 2008, Jeremy Karlson wrote: > I'm still looking into my watchdog timeout with me re card. I'm > starting to wonder if my problem is in any way related to the > discussion back in September 2006 starting with this post: > > "6.2 SHOWSTOPPER - em completely unusable on 6.2" > http://lists.freebsd.org/pipermail/freebsd-stable/2006-September/028792.htm >l > > It seems that under certain conditions and loads, a network interface > with a shared interrupt would stop responding until the watchdog > resets it. This seems to be very similar to what I see. At the time, > they seemed mostly concerned about fixing the em driver; I'm using re. > > Unfortunately though, I can't seem to find what the resolution to this > was, and if it could be related to the failure I'm seeing. Does > anyone know what happened with that problem? > > -- Jeremy If I remember correctly, there were two problems: 1) there was a race in the interrupt handler (this affected all interrupt handlers), 2) em used the now obsolete if_timer to implement it's watchdog timeout. This timer is unreliable. Both items have been fixed, so this shouldn't be related to your problem. #2 wasn't fixed in all drivers, but if you are affected you should see a warning on startup stating the use of the obsolete timer. I believe if_re was converted some time ago. Note that in theory watchdog timeouts could also mean broken hardware, bad connection to PCI bus or other intermittent hw failure. I would try reseating the card in another slot. -- Pieter de Goeje
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