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    SubjectRe: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node
    On Thu, 8 Feb 2007 11:09:40 -0800 (PST) Christoph Lameter <clameter@sgi.com> wrote:

    > > > > and to
    > > > > accurately present the machine's topology to the user without us having to
    > > > > go adding falsehoods like this?
    > > >
    > > > a node is a piece of memory. Without memory it doesn't make sense.
    > >
    > > Who said? I can pick up a piece of circuitry which has four CPUs and no
    > > RAM, wave it about then stick it in a computer. The kernel is just wrong,
    > > surely?
    >
    > Surely your computer has some memory so attach it to that memory (which
    > in a NUMA system would be one or the other node).

    "attach it". But it _isn't_ attached. There is no memory on this node.
    We seem to be saying that we should misrepresent the physical topology
    because the kernel doesn't handle it appropriately.

    > Cpu only "nodes" would mean that all memory would be off node. Meaning
    > whatever interconnect one has would be heavily used. Operating system and
    > application performance will suffer.

    From this a logical step would be to change the kernel to refuse to bring
    memoryless nodes online at all.

    If that's not an approproate solution, then there must be a legtimate
    reason for using memoryless nodes.

    Which is it?
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