On Fri, 2015-02-06 at 13:40 +0100, Peter Zijlstra wrote: > On Thu, Feb 05, 2015 at 11:04:20AM -0500, Steven Rostedt wrote: > Well, the thing is, with or without this patch, the worst case is still > the very same. The likelihood of actually triggering it goes down > dramatically [*], but any spin_lock() has that O(nr_cpus) worst case, and > that spinlock op isn't going away. > > Now, lowering avg/median cases is good, but don't kid yourself that the > worst case is going to be better. > > People running -RT on big boxes had better be aware of this. The folks I know of running -RT on big boxen isolate cores and nail absolutely everything to the floor. The only way to survive in a big box is to chop the thing into tiny pieces. A plasma cutter would be even better.. 'course you could just _buy smaller boxen_ and connect what you want connected, take the lazy path to big box solution ;-) -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
