Messages in this thread Patch in this message |  | | | Date | Tue, 17 May 2005 14:41:43 +0400 | | From | Kirill Korotaev <> | | Subject | Re: [PATCH] NMI watchdog config option (was: Re: [PATCH] NMI lockup and AltSysRq-P dumping calltraces on _all_ cpus via NMI IPI) |
> Kirill Korotaev <dev@sw.ru> wrote:
>
>>BTW, why NMI watchdog is disabled by default?
>
>
> There was a significantly large string of reports of dying PCs in the
> 2.4.early timeframe. These machines would mysteriously lock up after
> considerable periods of time and the problem was cured by disabling the NMI
> watchdog. Nobody was ever able to solve it, so we changed it to default to
> off.
Hmm, it is strange, since we used 2.4 kernels with watchdog for years
(starting from 2.4.1)...
> So much has changed in there that we might have fixed it by accident, and I
> do recall a couple of fundamental and subtle NMI bugs being fixed. So
> yeah, it might be worth enabling it by default again. Care to send a patch
> which does that?
I attached the patch which turns NMI watchdog on by default on i386.
Signed-Off-By: Pavel Emelianov <xemul@sw.ru>
Kirill
--- linux-2.6.12-rc4/arch/i386/kernel/nmi.c.nmiwd 2005-05-07 09:20:31.000000000 +0400
+++ linux-2.6.12-rc4/arch/i386/kernel/nmi.c 2005-05-17 13:47:38.000000000 +0400
@@ -34,7 +34,7 @@
#include "mach_traps.h"
-unsigned int nmi_watchdog = NMI_NONE;
+unsigned int nmi_watchdog = NMI_IO_APIC;
extern int unknown_nmi_panic;
static unsigned int nmi_hz = HZ;
static unsigned int nmi_perfctr_msr; /* the MSR to reset in NMI handler */ |  |