On Fri, May 29, 2015 at 08:48:56PM +0200, Mike Galbraith wrote: > > P.S. intel_idle is not all that wonderful on this box. > > - 78.31% [kernel] [k] _raw_spin_lock > > > ▒ > - _raw_spin_lock > > > ▒ > - 94.91% tick_broadcast_oneshot_control > > > ▒
Your DL980 G7 has E7-4800 parts in, right? Which if Wikipedia is correct, resolves to a Nehalem-EX. Now the NHM-EX has a fun 'feature' that for (some?) idle states the local timer stops, so we have to revert back to a global broadcast timer. Now go count the number of cpus on your box and then imagine a global spinlock, oh wait, you already found it ^ :-) -- 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/
