On Wed, 19 Feb 2014, Michal Hocko wrote: > Interesting. So is the PPC NUMA basically about local vs. very distant?
The point is that it's impossible to tell how distant they are from one NUMA domain to the next NUMA domain. > Should REMOTE_DISTANCE reflect that as well? Or can we have > distance < REMOTE_DISTANCE and it would still make sense to have > zone_reclaim enabled? > Ppc doesn't want to allocate in a different NUMA domain unless required, the latency of a remote access is too high. Everything that isn't in the same domain has a distance >10 and is setup as 2^(domain hops) * 10. We don't have the ability like with a SLIT to define remote nodes to have local latency vs remote or costly latency so the safe setting is a RECLAIM_DISTANCE of 10. -- 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/
