experimental 2.6.19 kernel preview.

[Arjan van de Ven]

On Sun, 2007-01-07 at 12:37 -0500, Dave Jones wrote:
> On Sun, Jan 07, 2007 at 05:38:44AM -0800, Arjan van de Ven wrote:
>  > On Sun, 2007-01-07 at 10:22 +0100, dragoran wrote:
>  > > ok now tested on my core 2 duo laptop (also using x86_64).
>  > 
>  > > what does this mean?
>  > > I don't see it with 2.6.18 and I have not seen any problems because of 
>  > > it (yet)
>  > > 
>  > you need to disable nmi_watchdog (by putting nmi_watchdog=0)
>  > the code is just broken in recent kernels :(
>  > (there's people in my team at Intel working on fixing this)
>  > 
>  > Dave: please disable nmi_watchdog by default in FC x86-64 kernels.. at
>  > least until the worst bugs are fixed (but even then it makes little
>  > sense to have it enabled anyway)
> 
> x86-64 has had it default on for ages though, it's only recently
> that i386 changed to match.  It's odd that it's only now causing problems.

NMI-meets-SMM is a general not fun thing; and even on x86-64 it should
be off (see Ingo's posts for this, it's hitting issues there too).
Also the NMI watchdog code changed recently to be.. well buggy.
(which we're fixing in my team but still as general principle..)