On 08/04/14 23:58, Christoph Lameter wrote:
The reason that zone reclaim is on by default is that off node accesses are a big performance hit on large scale NUMA systems (like ScaleMP and SGI). Zone reclaim was written *because* those system experienced severe performance degradation. On the tightly coupled 4 and 8 node systems there does not seem to be a benefit from what I hear.
In principle, is this difference in distance something the kernel could measure? -- Cheers, Jeremy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>