On 06/23/2014 05:39 PM, Paul E. McKenney wrote: > On Mon, Jun 23, 2014 at 05:20:30PM -0700, Dave Hansen wrote: >> On 06/23/2014 05:15 PM, Paul E. McKenney wrote: >>> Just out of curiosity, how many CPUs does your system have? 80? >>> If 160, looks like something bad is happening at 80. >> >> 80 cores, 160 threads. >80 processes/threads is where we start using >> the second thread on the cores. The tasks are also pinned to >> hyperthread pairs, so they disturb each other, and the scheduler moves >> them between threads on occasion which causes extra noise. > > OK, that could explain the near flattening of throughput near 80 > processes. Is 3.16.0-rc1-pf2 with the two RCU patches?
It's actually with _just_ e552592e03 applied on top of 3.16-rc1. > If so, is the new sysfs parameter at its default value? I didn't record that, and I've forgotten. I'll re-run it to verify what it was. -- 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/