On Wed, 25 Apr 2007 12:17:15 -0700 (PDT)
Christoph Lameter <[email protected]> wrote:
> 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.
I think so, too. It is because I made this as selectable option.
> 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?
>
Yes, it' in my plan. I'll add boot option support.
Thanks,
-Kame
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