On Thu, 8 May 2014, Cyrill Gorcunov wrote: > > > The NMI issue is probably the only one that is p4 related, and I do get > > > the NMI warnings on other machines too, it's just the p4 is the only one > > > where it brings down the machine. > > > > Vince, could you please provde more details on that? Is it possible > > to somehow log which events were used by perf? > > There were a bug in p4 pmu Don (CC'ed) fixed not that long ago but I fear > not all corner cases might be covered yet.
I hit the NMI warnings somewhat often on Intel hardware (Haswell, Core2) but it usually doesn't make the system unusable like it does on p4. I can try to get a trace, although I'm not sure it will be useful. I spent a lot of time getting a reproducible test case for the same warnings on core2 and it was unclear what the proble was and it was never fixed. The messages look like this: [ 2944.203423] Uhhuh. NMI received for unknown reason 31 on CPU 0. [ 2944.208006] Do you have a strange power saving mode enabled? [ 2944.208006] Dazed and confused, but trying to continue [ 2944.208006] Uhhuh. NMI received for unknown reason 21 on CPU 0. [ 2944.208006] Do you have a strange power saving mode enabled? [ 2944.208006] Dazed and confused, but trying to continue [ 2944.208006] Uhhuh. NMI received for unknown reason 31 on CPU 0. [ 2944.208006] Do you have a strange power saving mode enabled? [ 2944.208006] Dazed and confused, but trying to continue repeating forever, system is unusable. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
