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From: Mikael Pettersson <mikpe@csd.uu.se>
To: Mike Fedyk <mfedyk@matchmail.com>
Cc: Jesse Allen <the3dfxdude@hotmail.com>, linux-kernel@vger.kernel.org
Subject: Re: Catching NForce2 lockup with NMI watchdog
Date: Fri, 5 Dec 2003 13:06:24 +0100	[thread overview]
Message-ID: <16336.29888.91339.787315@alkaid.it.uu.se> (raw)
In-Reply-To: <20031205085829.GL29119@mis-mike-wstn.matchmail.com>

Mike Fedyk writes:
 > On Fri, Dec 05, 2003 at 08:40:58AM +0100, Mikael Pettersson wrote:
 > > Jesse Allen writes:
 > >  > Hi,
 > >  > 
 > >  > I have a NForce2 board and can easily reproduce a lockup with grep on an IDE 
 > >  > hard disk at UDMA 100.  The lockup occurs when both Local APIC + IO-APIC are 
 > >  > enabled.  It was suggested to me to use NMI watchdog to catch it.  However, the 
 > >  > NMI watchdog doesn't seem to work.
 > >  > 
 > >  > When I set the kernel parameter "nmi_watchdog=1" I get this message in 
 > >  > /var/log/syslog:
 > >  > Dec  4 20:10:30 tesore kernel: ..MP-BIOS bug: 8254 timer not connected to 
 > >  > IO-APIC
 > >  > Dec  4 20:10:30 tesore kernel: timer doesn't work through the IO-APIC - 
 > >  > disabling NMI Watchdog!
 > >  > 
 > >  > "nmi_watchdog=2" seems to work at first, In /var/log/messages:
 > >  > Dec  4 20:13:11 tesore kernel: testing NMI watchdog ... OK.
 > >  > but it still locks up.
 > > 
 > > The NMI watchdog can only handle software lockups, since it relies on
 > > the CPU, and for nmi_watchdog=1 the I/O-APIC + bus, still running.
 > > Hardware lockups result in, well, hardware lockups :-(
 > 
 > But nmi_watchdog=1 is supposed to work with APIC, or IO-APIC, and it isn't
 > for his motherboard.  It doesn't increment NMI in /proc/interrupts.  And it
 > gives the above error message.  Isn't that a bug?

nmi_watchdog=1 only falls back to nmi_watchdog=2 if no SMP is detected.
If the I/O-APIC is detected but doesn't work, then the fallback
does not happen, and you need to set nmi_watchdog=2 explicitly.

  reply	other threads:[~2003-12-05 12:06 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-05  4:54 Catching NForce2 lockup with NMI watchdog Jesse Allen
2003-12-05  7:40 ` Mikael Pettersson
2003-12-05  8:33   ` Josh McKinney
2003-12-05 12:14     ` Mikael Pettersson
2003-12-05 14:19       ` Craig Bradney
2003-12-05 17:05         ` Craig Bradney
2003-12-05 18:11         ` Josh McKinney
2003-12-05  8:58   ` Mike Fedyk
2003-12-05 12:06     ` Mikael Pettersson [this message]
2003-12-08  2:20     ` Bob
2003-12-09 14:21       ` Maciej W. Rozycki
2003-12-09 16:35         ` Bob
2003-12-10 13:41           ` Maciej W. Rozycki
2003-12-12 16:01             ` bill davidsen
2003-12-12 16:47               ` Maciej W. Rozycki
2003-12-12 16:57                 ` Richard B. Johnson
2003-12-12 17:21                   ` Maciej W. Rozycki
2003-12-13  5:16                 ` Bill Davidsen
2003-12-15 13:23                   ` Maciej W. Rozycki
2003-12-12 22:27               ` George Anzinger
2003-12-15 13:13                 ` Maciej W. Rozycki
2003-12-15 21:42                   ` George Anzinger
2003-12-16 13:37                     ` Maciej W. Rozycki
2003-12-16 13:57                       ` Richard B. Johnson
2003-12-16 15:47                         ` Maciej W. Rozycki
2003-12-16 16:44                           ` Richard B. Johnson
2003-12-16 16:50                             ` Maciej W. Rozycki
2003-12-16 17:26                       ` George Anzinger
2003-12-16 20:54                         ` Maciej W. Rozycki
2003-12-16 21:53                           ` George Anzinger
2003-12-17 14:03                             ` Maciej W. Rozycki
2003-12-05 19:11 Allen Martin
2003-12-05 20:18 ` cheuche+lkml
2003-12-05 20:34   ` Prakash K. Cheemplavam
2003-12-05 21:02     ` Mike Fedyk
2003-12-05 20:55   ` Jesse Allen
2003-12-06  3:20   ` Jesse Allen
2003-12-05 20:36 ` Jesse Allen
2003-12-05 22:55 ` Mike Fedyk
2003-12-05 23:11   ` Craig Bradney
2003-12-05 20:56 Allen Martin
2003-12-05 22:41 b
2003-12-07 19:58 Fixes for nforce2 hard lockup, apic, io-apic, udma133 covered Ian Kumlien
2003-12-08  2:07 ` Ross Dickson
2003-12-09 18:12   ` Catching NForce2 lockup with NMI watchdog Ian Kumlien
2003-12-09 22:04     ` Craig Bradney
2003-12-09 23:13       ` Ian Kumlien
2003-12-10  6:14       ` Bob
2003-12-10  7:51         ` Craig Bradney
2003-12-13  3:56 Ross Dickson
2003-12-15 13:16 ` Maciej W. Rozycki
2003-12-17 18:14 Ross Dickson
2003-12-17 21:41 ` George Anzinger
2003-12-17 21:48 ` George Anzinger
2003-12-18  1:30   ` Ross Dickson
2003-12-18 14:32     ` Maciej W. Rozycki
2003-12-19  4:17       ` Ross Dickson
2003-12-19 15:35         ` Maciej W. Rozycki
2003-12-18 14:04 ` Maciej W. Rozycki
2003-12-18 14:22   ` Craig Bradney
2003-12-19  5:38     ` Ross Dickson
2003-12-19 10:36       ` Craig Bradney
2003-12-19  4:06   ` Ross Dickson
2003-12-19 15:33     ` Maciej W. Rozycki

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