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    SubjectRe: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL
    Andi Kleen wrote:
    > On Monday 02 April 2007 23:56:08 Dave Hansen wrote:
    >> On Mon, 2007-04-02 at 14:28 -0700, Christoph Lameter wrote:
    >>> I do not care what its called as long as it
    >>> covers all the bases and is not a glaring performance regresssion (like
    >>> SPARSEMEM so far).
    >> I honestly don't doubt that there are regressions, somewhere. Could you
    >> elaborate, and perhaps actually show us some numbers on this? Perhaps
    >> instead of adding a completely new model, we can adapt the existing ones
    >> somehow.
    >
    > If it works I would be inclined to replaced old sparsemem with Christoph's
    > new one on x86-64. Perhaps that could cut down the bewildering sparsemem
    > ifdef jungle that is there currently.
    >
    > But I presume it won't work on 32bit because of the limited address space?

    Right. But we might be able to do switch SPARSEMEM_EXTREME users here
    if performance is better and no other regressions are detected.

    There seems to be a theme, we need to get some numbers. I will try and
    get what I can with the hardware I have and see whats missing.

    >
    >> But, without some cold, hard, data, we mere mortals without the 1024-way
    >> machines can only guess. ;)


    -apw
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