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    SubjectRe: [tip:sched/core] x86/numa: Allow specifying node_distance() for numa=fake
    On Wed, 9 May 2012, tip-bot for Peter Zijlstra wrote:

    > Commit-ID: 94c0dd3278dd3eae52eabf0fb77d472d0dd3e373
    > Gitweb: http://git.kernel.org/tip/94c0dd3278dd3eae52eabf0fb77d472d0dd3e373
    > Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > AuthorDate: Wed, 18 Apr 2012 19:04:17 +0200
    > Committer: Ingo Molnar <mingo@kernel.org>
    > CommitDate: Wed, 9 May 2012 13:28:59 +0200
    >
    > x86/numa: Allow specifying node_distance() for numa=fake
    >
    > Allows emulating more interesting NUMA configurations like a quad
    > socket AMD Magny-Cour:
    >
    > "numa=fake=8:10,16,16,22,16,22,16,22,
    > 16,10,22,16,22,16,22,16,
    > 16,22,10,16,16,22,16,22,
    > 22,16,16,10,22,16,22,16,
    > 16,22,16,22,10,16,16,22,
    > 22,16,22,16,16,10,22,16,
    > 16,22,16,22,16,22,10,16,
    > 22,16,22,16,22,16,16,10"
    >
    > Which has a non-fully-connected topology.
    >

    I like this support and I'm pretty sure you used it to reproduce my
    problems with sched/numa locally, but I think it would be better to
    seperate it out as a different parameter such as slit=fake so that we can
    still use it to fake the SLIT of our NUMA machines without requiring
    numa=fake which provides no guarantees to break the nodes along physical
    boundaries.

    So without seperating it out into slit=fake, we can't change this
    information without changing the SLIT itself and that makes debugging
    harder.


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