On Thu, 2018-04-05 at 10:27 +0200, Peter Zijlstra wrote: > On Thu, Apr 05, 2018 at 09:11:38AM +1000, Nicholas Piggin wrote: > > Hi, > > > > I'm seeing some pretty big latencies on a ~idle system when a CPU wakes > > out of a nohz idle. Looks like it's due to the taking a lot of remote > > locks and cache lines. irqoff trace: > > On RT I think we default RT_RUNTIME_SHARE to false, maybe we should do > the same for mainline.
Probably. My very first enterprise encounter with the thing was it NOT saving a box from it's not so clever driver due to that. -Mike