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    SubjectRe: [PATCH 4/4] zone_reclaim_mode is always 0 by default
    Christoph Lameter wrote:
    > Not having zone reclaim on a NUMA system often means that per node
    > allocations will fall back. Optimized node local allocations become very
    > difficult for the page allocator. If the latency penalties are not
    > significant then this may not matter. The larger the system, the larger
    > the NUMA latencies become.
    >
    > One possibility would be to disable zone reclaim for low node numbers.
    > Eanble it only if more than 4 nodes exist?

    I suspect that patches 1/4 through 3/4 will cause the
    system to behave better already, by only reclaiming
    the easiest to reclaim pages from zone reclaim and
    falling back after that - or am overlooking something?


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