>> Node 0 (or more specifically the node that contains memory<4GB) will be >> full of BIOS reserved holes in the memory map. > One thing I'm not sure, is memory<4GB always on node 0 ? > On my box, it is on node 0. I think in practice the <4GB memory will be on node 0 ... but it all depends on how Linux decides to number the nodes ... which in turn depends on the order of entries in various BIOS tables. So it is theoretically possible that we'd end up with some system on which the low memory is on some other node. But it might require stranger than usual BIOS. Summary: coding "node == 0" is almost 100% certain to be right - except on some pathological systems. So code for node==0 and if we ever see a pathological machine - we can either point and laugh at the BIOS people that set that up - or possibly fix our code. -Tony -- 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