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    SubjectRe: [PATCH] x86: eliminate redundant/contradicting cache line size config options
    On Mon, 23 Nov 2009 09:34:59 +0100
    Ingo Molnar <mingo@elte.hu> wrote:

    >
    > * Arjan van de Ven <arjan@infradead.org> wrote:
    >
    > > On Thu, 19 Nov 2009 09:13:07 +0100
    > > Nick Piggin <npiggin@suse.de> wrote:
    > > >
    > > > My other point was just this, but I don't care too much. But it is
    > > > worded pretty negatively. The key here is that increasing the
    > > > value too large tends to only cost a very small amount of size
    > > > (and no increase in cacheline foot print, only RAM).
    > >
    > > 128 has a pretty significant impact on TPC-C benchmarks.....
    > > it was the top issue until mainline fixed it to default to 64
    >
    > Mind sending a patch that sets the default to 64 on NUMA too?
    >
    > P4 based NUMA boxes are ... a bad memory to be forgotten.

    this patch adds a regression. Linux defaulted to 64 since.. march or so.

    now we go back to the old setting; Nick should fix that. Or at least
    extremely document and justify this change....



    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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