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    SubjectRe: question about M2 "feature"

    On Tue, 22 Jul 1997, Patrick St. Jean wrote:

    > I saw it in "Windows Sources" August 1997 issue. Page 108 third column.
    >
    > here's the quote:
    > [snip]
    > An intersting feature available on the 6x86MX, which has yet to be
    > implemented in software is Scratchpad RAM. This tiny 8K block of cache on
    > the chip stores small pieces of code locally, rather than in the L2 cache.
    > Cyrix promises that this will allow a serious performance boost to any
    > instructions an application might post there.
    >
    > end quote.

    we could use that area for free memory handling.

    we could put the single-page usage bitmap there, 8k is enough to handle up
    to about 256M RAM if 1 bit represents 1 page. (a bit less than 256M RAM,
    since some bits are needed for higher order coverage bits)

    gosh, ~10 cycles __guaranteed__ get_free_page() execution time, ~20 cycles
    average free_page() execution time ;) and no L1/L2 cache trashing :)

    -- mingo


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