Messages in this thread | | | Date | Tue, 8 Apr 2014 09:14:05 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 1/2] mm: Disable zone_reclaim_mode by default |
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On Mon, 7 Apr 2014, Mel Gorman wrote:
> zone_reclaim_mode causes processes to prefer reclaiming memory from local > node instead of spilling over to other nodes. This made sense initially when > NUMA machines were almost exclusively HPC and the workload was partitioned > into nodes. The NUMA penalties were sufficiently high to justify reclaiming > the memory. On current machines and workloads it is often the case that > zone_reclaim_mode destroys performance but not all users know how to detect > this. Favour the common case and disable it by default. Users that are > sophisticated enough to know they need zone_reclaim_mode will detect it.
Ok that is going to require SGI machines to deal with zone_reclaim configurations on bootup. Dimitri? Any comments?
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