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    SubjectRe: [RFC] VM: I have a dream...
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    >> So we know it [single level storage] works, but also that people don't 
    seem to care much for it
    >
    >People didn't care, because the AS/400 was based on a proprietary
    solution.

    I don't know what a "proprietary solution" is, but what we had was a
    complete demonstration of the value of single level storage, in commercial
    use and everything, and other computer makers (and other business units
    of IBM) stuck with their memory/disk split personality. For 25 years,
    lots of computer makers developed lots of new computer architectures and
    they all (practically speaking) had the memory/disk split. There has to
    be a lesson in that.

    >With todays generically mass-produced 64bit archs, what's not to care
    about a
    >cost-effective system that provides direct mapped access into linear
    address
    >space?

    I don't know; I'm sure it's complicated. But unless the stumbling block
    since 1980 has been that it was too hard to get/make a CPU with a 64 bit
    address space, I don't see what's different today.

    --
    Bryan Henderson IBM Almaden Research Center
    San Jose CA Filesystems

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