On Fri, 2007-04-27 at 09:27 +0900, KAMEZAWA Hiroyuki wrote: > On Thu, 26 Apr 2007 08:48:19 -0700 (PDT) > Christoph Lameter <[EMAIL PROTECTED]> wrote: > > > On Thu, 26 Apr 2007, KAMEZAWA Hiroyuki wrote: > > > > > (1)Use new zonelist ordering always and move init_task's tied cpu to a > > > cpu on the best node. > > > Child processes will start in good nodes even if Node 0 has small > > > memory. > > > > How about renumbering the nodes? Node 0 is the one with no DMA memory and > > node 1 may be the one with the DMA? That would take care of things even > > without core modifications. We can start on node 0 (which hardware 1) and > > consume the required memory for boot there not impacting the node with the > > DMA memory. > > > It seems a bit complicated. If we do so, following can occur, > > Node1: cpu0,1,2,3 > Node0: cpu4,5,6,7 > > the system layout will be not imaginable look, maybe.
Interesting. A colleague recently showed me that this can occur on HP platforms if we boot from, say, node 1 instead of node 0. The kernel doesn't mind because it maintains a translation of cpus to nodes and vice versa. Applications don't need to mind if they use libnuma's numa_node_to_cpus(), rather than assume a fixed relationship. But, I agree, that it may surprise some people when/if node_id != cpu_id/cpus_per_node. Lee - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
