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SubjectRe: [PATCH] NMI watchdog config option (was: Re: [PATCH] NMI lockup and AltSysRq-P dumping calltraces on _all_ cpus via NMI IPI)
On Tue, 17 May 2005, Linus Torvalds wrote:

> > BTW, why NMI watchdog is disabled by default? We constantly making it on
> > by default in our kernels and had no problems with it.
> > I send a patch attached which tunes NMI watchdog by config option...
> I really don't want NMI watchdogs enabled by default. It's historically
> been _very_ fragile on some systems. Whether that has been due to harware
> or sw bugs, I dunno, but it's definitely been problematic.

Mostly or perhaps even exclusively due to BIOS bugs -- you know, that
piece of hidden firmware that runs in the SMM under our feet and fiddles
randomly with hardware we can do nothing about.

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