On Thu, 2014-05-15 at 07:45 -0700, Paul E. McKenney wrote: > On Thu, May 15, 2014 at 05:18:51AM +0200, Mike Galbraith wrote: > > On Wed, 2014-05-14 at 08:44 -0700, Paul E. McKenney wrote: > > > > > In practice, not sure how much testing CONFIG_NO_HZ_FULL=y has received > > > for -rt kernels in production environments. > > > > I took 3.14-rt out for a quick spin on my 64 core box, it didn't work at > > all with 60 cores isolated. I didn't have time to rummage, but it looks > > like there are still bugs to squash. > > > > Biggest problem with CONFIG_NO_HZ_FULL is the price tag. It just raped > > fast mover performance last time I measured. > > I do have a report of the RCU grace-period kthreads (rcu_preempt, > rcu_sched, and rcu_bh) consuming excessive CPU time on large boxes, > but this is for workloads with lots of threads and context switches. > > Whether relevant or not to your situation, working on it... RCU signal was swamped by accounting. -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
