On Wed, 25 Apr 2007, KAMEZAWA Hiroyuki wrote:
> Make zonelist policy selectable from sysctl.
>
> Assume 2 node NUMA, only node(0) has ZONE_DMA (ZONE_DMA32).
>
> In this case, default (node0's) zonelist order is
>
> Node(0)'s NORMAL -> Node(0)'s DMA -> Node(1)"s NORMAL.
>
> This means Node(0)'s DMA is used before Node(1)'s NORMAL.
So a IA64 platform with i386 sicknesses? And pretty bad case of it since I
assume that the memory sizes per node are equal. Your solution of taking
4G off node 0 and then going to node 1 first must hurt some
processes running on node 0. But there is no easy solution since
the hardware is badly screwed up with 32 bit I/O. Whatever you do the
memory balance between the two nodes is making the system behave in
an unsymmetric way.
> In some server, some application uses large memory allcation.
> This exhaust memory in the above order.
Could we add a boot time option instead that changes the zonelist build
behavior? Maybe an arch hook that can deal with it?
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