Messages in this thread | | | Date | Thu, 14 May 2009 16:23:18 -0400 | From | Rik van Riel <> | Subject | Re: [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?
| |