Messages in this thread | | | Date | Thu, 26 Apr 2007 09:31:12 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [RFC][PATCH] syctl for selecting global zonelist[] order |
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On Wed, 25 Apr 2007 12:17:15 -0700 (PDT) Christoph Lameter <clameter@sgi.com> 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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